The reputed boss of the Gambino crime family was sentenced today to three years in prison after plea-bargaining to an assault charge in a 1989 murder plot against a suspected informant.

John “Jackie the Nose” D’Amico, 74, received the maximum sentence allowable.

He had admitted to conspiring to commit an assault against Frederick Weiss, a sanitation exec who had run afoul of then-mob boss John Gotti.

According to papers filed in Manhattan federal court, D’Amico allowed co-defendant Joseph Watts, a reputed high-ranking Gambino associate, to recruit members of his crew for a hit on Weiss.

Authorities believe Weiss was instead murdered by New Jersey’s DeCavalcante mob as a favor to the Dapper Don.