The man accused of acting as lookout during the prison killing of notorious Boston gangster James "Whitey" Bulger was sentenced to time served Monday after pleading guilty to a charge of lying to federal agents. Sean McKinnon was accused along with two other inmates in the 2018 killing at a troubled West Virginia prison.

The defendant, Sean McKinnon, 38, escaped additional prison time after prosecutors dropped a more serious murder conspiracy charge. He was initially charged with serving as a lookout, while two other inmates at the Hazelton federal prison, Fotios (Freddy) Geas and Paul DeCologero, rained a series of savage blows on Mr. Bulger’s head.