Former New England Mafia boss Francis "Cadillac Frank" Salemme (sah-LEHM'-ee) and a mob associate have been indicted in the 1993 killing of a Boston nightclub owner.

An indictment unsealed Friday charges Salemme and Paul Weadick with the murder of federal witness Steven DiSarro. Salemme was arrested last month. Weadick was arrested Friday.

The indictment alleges that Salemme, Weadick and Salemme's son participated in DiSarro's killing to prevent him from talking to authorities about illegal activities by Salemme and others.

The 83-year-old Salemme led the New England family of La Cosa Nostra in the early 1990s. His son died in 1995.

DiSarro's remains were found in March behind a mill in Providence, Rhode Island.

Salemme denies participating in DiSarro's killing. Weadick's lawyer couldn't immediately be reached for comment.