BALTIMORE—An off-duty police officer who was getting a haircut shot and killed a man who burst into a Baltimore barber shop and fatally shot a barber, police said. Police said they believe the same man was responsible for two earlier shootings, one of them fatal. The Baltimore Sun reports that police are trying to determine a motive linking all three shootings. Police said one victim was in critical condition after a shooting that occurred at about 2 p.m. Saturday following an argument. Another victim died from a shooting near the Greektown section of Baltimore. The third and final shooting happened at about 3:15 p.m. at The Bladi Style barber shop in Baltimore’s Medford neighborhood. Police Commissioner Michael Harrison said the suspect “entered the barber shop, produced a handgun, fired it at one of the barbers who was working in the barber shop, striking that barber.” Harrison said the off-duty Baltimore …