Boston police have identified the victim in a fatal Dorchester shooting early Monday as a 36-year-old Dorchester man who originally hailed from Ireland. Ciaran Conneely was from Galway, police said. Conneely was found shot at about 1:04 a.m. in the area of 20 Nahant Ave. He was pronounced dead at the scene. Neighbors told the Globe they were stunned by the shooting. They said the shooting followed the annual Irish Heritage Festival, which drew large crowds to Adams Corner earlier in the day.