April 29, 2025

Jealousy, Journals, and Justice: The Horwitz Family Murder

Jealousy, Journals, and Justice: The Horwitz Family Murder

Jealousy, Journals, and Justice: The Horwitz Family Murder

Lanny Horwitz built a life most people would envy—real estate success, international travel, the dream house in Boca Raton. But what he couldn’t seem to quit was his high school sweetheart....

Jealousy, Journals, and Justice: The Horwitz Family Murder

Lanny Horwitz built a life most people would envy—real estate success, international travel, the dream house in Boca Raton. But what he couldn’t seem to quit was his high school sweetheart. After two marriages, two divorces, and one seriously tangled family dynamic, Lanny and Donna found themselves under the same roof again.

What came next unraveled a story of long-term resentment, romantic triangulation, and a murder scene that made absolutely no sense. This episode breaks down the final days of Lanny Horwitz and the investigation that pulled his family—and his past—apart.

#LannyHorwitz #TrueCrimePodcast #BocaRatonMurder #CrimeStory #DonnaHorwitz #FloridaCrime #DoubleDivorce #FamilyMurder


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They met in high school, got married, got divorced, got married again, got divorced again,

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and then years later moved back in together like none of that ever happened.

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Your classic love story.

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Right.

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But when you mix decades of resentment, a new girlfriend, and a journal that reads like

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a slow burn crime novel, it's not exactly a recipe for a quiet retirement.

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This is the story of Lanny Horowitz, and how one very long love story ended in gunfire,

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under pointing, and a trial that split a family in half.

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Before we dive in, if you like your true crime brief and bingeable, you're in the right

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place.

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Hit follow now for at least two new episodes every week.

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This is 10 Minute Murder.

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Let's get into it.

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[Music]

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Late 1940s, Buffalo, New York.

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Go Bills.

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Two high schoolers side by side, Donna Carnivale, was bright, sharp, and the kind of beautiful

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that stomps a crowded room cold.

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Lanny Horowitz, he was the guy that couldn't believe she even knew his name.

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But somehow she did.

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Nervous, maybe even sweating through his collar, Lanny asked if they could make it official.

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And when Donna said yes, it hit him like a grand slam to the chest.

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But there was one small catch.

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Donna wasn't just a pretty face.

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She was also the daughter of Dan Carnivale, a local legend who had played four, managed,

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and run the Buffalo Biscuits.

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The man was literally in the baseball hall of fame, and his wallet reflected it.

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Donna had grown up surrounded by money, comfort, and the kind of lifestyle that didn't come

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cheap.

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So while she liked Lanny, he was going to have to work for it a lot.

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And he did.

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By 16, Lanny was already helping his dad sell real estate.

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By their early 20s, he and Donna were married, and Lanny was on his way to building a small

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empire.

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They were traveling the world.

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As brother Barry said, he had sailboats, airplanes, anything life could offer was there for them.

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From the outside, things looked golden.

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They had a sun.

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They had the cars, the clothes, the gated community, and Boko Raton.

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Lanny even built the family's mansion himself.

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But inside the house, things weren't nearly as perfect.

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Donna had everything money could buy.

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One thing she didn't have was her husband.

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Somewhere along the way, Lanny and Donna stopped being starry eyed teenagers and became

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two people that couldn't stand to be in the same room together.

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The love story turned into shouting matches, and eventually turned into silence, the kind

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that fills every corner of the house.

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By 2001, the marriage was done.

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After nearly 40 years, they called it quits.

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For a minute, anyway, because five months later, they were back at it.

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Divorce, finalized in May, remarried in September.

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Love was love, apparently.

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Or maybe it was habit.

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Or muscle memory.

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Either way, it didn't last.

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By June 2002, they were divorced again.

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This time it was for good.

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Or so it seemed.

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Lines were drawn, assets divided, and everyone went their separate ways.

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And for the first time in his adult life, Lanny fell in love with someone who wasn't Donna.

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Her name was Francine Tyson, a woman he knew from work.

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It was new, but it was real.

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According to Lanny's brother, Barry, "They were holding hands, kid stuff."

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She said he hadn't seen Larry that happy in 40 years, which also happened to be the exact

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amount of time that Larry had been married to Donna.

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But Donna still held the position no other woman could.

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She wasn't just his ex.

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She was his high school sweetheart, his first wife, his second wife, and the mother of his

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only child, Radley.

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Radley had just hit a rough patch of his own.

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Now a single dad with a baby daughter, he needed support.

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So the family rallied.

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She and his daughter moved into the floor to home Lanny had built decades earlier.

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And Donna and Lanny moved back in too.

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The setup was meant to help their son.

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But it was about to bring everything full circle.

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Moving back in was supposed to be about supporting their son.

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That was the plan.

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But somewhere between cohabitating and co-parenting, Lanny and Donna started to drift back toward

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something more.

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Despite Lanny's feelings for Francine, despite their long messy history, Donna seemed to

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determine to pick up right where they'd left off.

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Again.

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Then came September 30th 2011.

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Radley was asleep when he heard the gunfire.

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He jumped out of bed and ran to the master bedroom.

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What he found was his mother screaming and repeating over and over.

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He was so awful.

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But he hadn't seen the body yet.

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Lanny was on the floor covered in blood, barely hanging on.

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He'd been shot nine times.

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He died seconds later.

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The community security guard was the first to arrive.

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He found Lanny with the gun in his hand.

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Donna told him it was suicide.

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But even the guard wasn't convinced and called the police.

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When officers showed up, Donna clamped up, wouldn't answer questions.

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And there were a lot of questions.

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Like if Lanny really shot himself, why was he holding the house phone like he was trying

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to call for help?

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The guard of someone managed to shoot themselves nine times, including once through the mouth,

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and still have time to hold up a gun.

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Why was the gunpowder on the outside of his towel if he supposedly fired from behind

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the shower curtain?

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None of it tracked.

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Police moved quickly from suicide to homicide, which left them with one pressing question.

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Who did it?

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There were no signs of forced entry.

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No alarms had gone off.

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The gated community had reported no strangers on the property.

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Whoever pulled the trigger had already been inside.

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And that left two options.

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Donna or her son Radley.

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Neither had a solid alibi.

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Both had reason to be angry with Lanny.

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And now the investigators had to figure out which one of them pulled the trigger.

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Or if both played a part.

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Inside the house, investigators found what can only be described as an arsenal.

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Twenty-six firearms and thousands of rounds of ammo.

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Among the collection were two revolvers used to kill Lanny.

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But it wasn't just the weapons they caught their attention.

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They also found Donna's journal.

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And it wasn't just personal reflections and the occasional ramble.

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Donna had been keeping tabs on Lanny down to the minute.

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Land went to France 520.

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Another day of lies and being Mr. Meeney.

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Turns out the relationship reboot hadn't erased Lanny's feelings for Francine.

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Not even close.

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According to Radley, Donna had figured out pretty quickly that her ex-husband was still

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very much in love with the other woman.

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He was still seeing Francine going to lunch, going to dinner.

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It looked like more than business.

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He said she found out he was paying for her phone bill.

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Paying her to decorate the North Carolina house he and my mom were supposedly building together.

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Sneaky?

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Sure.

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But it wasn't exactly a secret.

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Lanny had made it pretty clear where his heart was.

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He wanted to be with Francine.

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The only reason he wasn't is because she wasn't ready.

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At least not yet.

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Prosecutor Alitha McRoberts told the jury that Francine admitted Lanny had deeper feelings

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than she did.

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He'd even proposed.

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Phone records backed it up.

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The two had been in constant contact.

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They were texting the night before Lanny died, making plans for her to pick him up the

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next morning.

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She never got the chance.

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According to court testimony, Lanny had told Donna it was over for real this time.

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He expected her to be out of the house before he returned from his trip with Francine.

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Instead he was dead by sunrise.

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Donna was arrested for his murder just six days later.

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At trial her defense took a hard left and pointed the finger directly at Radley.

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Yes, her own son.

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They argued that Radley, a convicted felon with a prior charge for illegally selling

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a firearm, had the most to gain.

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He was financially unstable, struggling to support his baby daughter and would have benefited

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from Lanny's life insurance payout.

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The defense claim Radley let a hitman into the house that morning.

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That's why no alarms went off.

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That's why someone else's DNA was found under a smear of Lanny's blood on the gate outside.

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It was a bold strategy, but the question wasn't just who had motive.

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He was who wanted Lanny enough to kill him and who had the most to lose when he walked away.

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The prosecution pushed back hard.

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That unidentified DNA on the gate, it could have been left there days or even weeks before

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the murder.

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It wasn't proof of a hitman.

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But Donna's journal, that, was personal.

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That was detailed and it painted a picture of someone consumed by jealousy and resentment.

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Someone who knew exactly when to strike.

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The jury didn't need long.

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For just two hours, they found Donna guilty of first degree murder.

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She was sentenced to life without parole.

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But that wasn't the end.

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Her conviction was overturned when it came out that the prosecution had used statements

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Donna made before being read her Miranda rights.

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So she was retried.

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This time, the jury found her guilty of second degree murder.

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Her sentence was updated to 32 years.

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She'll be in her 90s before she's eligible for parole.

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Bradley hasn't spoken to her since.

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Quote, "Even though she tried to blame me, I was really sympathetic to her until I saw

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the photos of my dad.

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That's when the sympathy ended."

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Thanks for listening to 10 Minute Murder, brief and bingeable true crime.

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Make sure you're subscribed wherever you're listening so new episodes show up without you

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even having to think about it.

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You can follow the podcast on Facebook, Instagram and TikTok and everything else is at 10minuteMurder.com.

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Some stories are complicated.

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This one was exhausting.

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It had decades of history, more red flags than a parade, and somehow still managed to

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surprise people who thought they'd seen it all.

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Alright, go reset your brain.

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I'll be back next time with another story you didn't know that you needed to know.

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Thanks for listening to 10 Minute Murder.

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Nadios.