HARTFORD, Conn. (AP) — A 76-year-old reputed mobster has pleaded guilty in a Connecticut weapons and prescription drugs case that revealed the FBI's belief that he has information about the largest art heist in history.

Robert Gentile (JEN'-tile), of Manchester, entered the pleas Wednesday in federal court in Hartford. He faces a prison sentence of around four years.

During a hearing earlier this year, a federal prosecutor disclosed that the FBI believes Gentile had some involvement with stolen property related to the 1990 heist at Boston's Isabella Stewart Gardner Museum. Thieves made off with masterworks by Rembrandt, Vermeer, Degas and Manet worth more than a half-billion dollars.

Gentile hasn't been charged in the art heist and insists he knows nothing about it. The theft wasn't mentioned in the plea deal or at Wednesday's hearing.