WORCESTER — A former resident of a Massachusetts center for the developmentally disabled has pleaded guilty to manslaughter in the death of another facility resident.The Telegram & Gazette reports that 26-year-old Anthony Remillard, of Worcester, was sentenced Monday to seven years in prison in the 2013 death of 64-year-old Dennis Perry at the Templeton Developmental Center.Prosecutors say Remillard pushed Perry, who fell and hit his head.