In December of 2002, NBC News producer Dan Slepian got a letter from a New York state prison. It was detailed and meticulous, almost like it had been written by a lawyer. But it wasn’t. It was from a man serving 25 years to life for murder. And it ended with a desperate plea: look into my case.

Jon-Adrian “JJ” Velazquez had been convicted of killing a retired New York City police officer, but he insisted he didn’t do it. Dan was skeptical. Prosecutors said five eyewitnesses had sworn JJ was the killer. Could five people be wrong?

But JJ was adamant about his innocence. He had devoted years to fighting his case, spending hours in the law library, poring over every page of his file. He was confident that if Dan looked into it, he’d see the truth. He even challenged Dan to prove him guilty.

So Dan began to dig. What he discovered went far beyond just JJ’s case. And 20 years later, it’s still unfolding.

Letters from Sing Sing tells the story of a man convicted of murder, a journalist, and the letter that changed both of their lives. New episodes drop every Monday through March 27, 2023.

In December of 2002, NBC News Producer Dan Slepian got a letter from a New York State maximum security prison. It was detailed and meticulous, almost like it had been written by a lawyer. It was from a man serving 25 years to life for murder. And it ended with a desperate plea: look into my case.

In 1998, Jon-Adrian “JJ” Velazquez was arrested for killing a retired New York City police officer. A year later, he was convicted of second degree murder. But he insisted he didn’t do it. Dan was skeptical. Prosecutors said five eyewitnesses had sworn JJ was the killer. Could five people be wrong?

So Dan pays JJ a visit. And at the end of it, JJ gives Dan a challenge: prove me guilty.

JJ Velazquez claimed he had an alibi: a 74-minute phone call on a landline with his mother, Maria Velazquez, that overlapped with the time of the crime. So Dan visits Maria. She lives in a town in New York on the Hudson River directly across from Sing Sing, the maximum security prison where her son is incarcerated. Maria talks to Dan about JJ’s childhood. And she recounts in detail her memory of January 27th, 1998, the day of Al Ward’s murder.

Meanwhile, Dan is still familiarizing himself with JJ’s case file. There are thousands of pages of documents that sit in a box by his desk. He starts to work his way through the trial transcript. Immediately, it’s clear to him that the trial was strange. As Dan unpacks what happened in the courtroom, he’s left with more questions than answers. Prosecutors say five people identified JJ as the man who killed Al Ward. Dan decides to find them.