George Nassar, 86, Killer Who Heard Confession in Strangler Case, Is Dead

A fellow inmate, Albert DeSalvo, told him that he was the Boston Strangler who had killed 13 women in the early 1960s. Mr. Nassar’s death, in 2018, had gone unreported.

source https://www.nytimes.com/2023/03/28/us/george-nassar-dead.html