Sullivan, William "Billy" of Dorchester, passed away on February 18 at the age of 53, surrounded by his loving family. Billy was a lifelong resident of Dorchester. Dear brother of Marjorie McDonough and her husband David of FL, Maureen Cellucci and her late husband Stephen of Quincy, Rita Alvarado and her husband Peter of Quincy, AnneMarie Daly and her husband Stephen of Marshfield, Thomas Sullivan of Dorchester and the late Patricia Sullivan and John J. Sullivan. Dear son of the late Cornelius and Marjorie (Prendiville) Sullivan. Also survived by many nieces and nephews. A Mass will be held on Saturday, April 11 in St. Marks Church, 1725 Dorchester Ave, Dorchester Center, MA at 10:00 a.m. Family and friends are invited.