A man shot to death inside a Dorchester hair salon on Thursday night was identified Sunday by Boston police as Stephan Pires, 20, of Boston. While getting a haircut, Pires was shot in the head at the Universal Barber Shop & Beauty Salon at 436 Geneva Ave. shortly after 7 p.m. when a lone gunman opened fire inside the salon, police have said. A woman in her 70s was hospitalized after she also was shot, according to police. She was expected to survive. Authorities have said that they believe Pires was targeted but that the woman was not. Police asked that anyone with information call homicide detectives at 617-343-4470, call the department’s anonymous tip line at 800-494-TIPS, or text the word TIP to CRIME (27463).