Three young people from Dorchester were killed on Tuesday morning when their car careened off of Morrissey Boulevard and slammed into a bridge abutment next to the Dunkin’ Donuts just after 4:30 a.m., according to Massachusetts State Police report. The accident happened at a curve in the northbound roadway just across from the intersection with Popes Hill Street. The Suffolk County District Attorney’s office reports two male victims, 19 and 20, were pronounced dead at the scene. The third victim, a 19-year-old woman, was extricated from the remains of the car with the Jaws of Life, but was pronounced dead at a local hospital. The three victims have been identified by the Boston Globe as John Doherty-Carter, Paul Reagan and Samantha Pinson. Morrissey Boulevard was shut on Tuesday morning as police investigated the fatal crash and reopened for traffic about 9 a.m.