Former Mafia boss "Cadillac Frank" Salemme dies in prison at 89

Francis "Cadillac Frank" Salemme, the once powerful New England Mafia boss who was serving a life sentence behind bars for the 1993 killing of a Boston nightclub owner, has died at the age of 89, according to the Bureau of Prisons.

Salemme died on Tuesday, according to Bureau of Prisons' online records. Bureau officials did not immediately respond to an email seeking more information on Sunday. Salemme's death was first reported Sunday by WPRI-TV.

Salemme led the Patriarca crime family in Boston in the early 1990s before helping prosecutors convict a corrupt FBI agent after learning that other mobsters had been talking about him to authorities.