Smith opened fire on the victims with both his AR-15 semiautomatic rifle and 9 mm handgun . First , he killed both Cline and Porterfield , by gunning them down in the car wash 's parking lot after they stepped out of their sedan . He then killed Snyder and Cline 's half-brother as they sat in their pickup truck . The unidentified woman with them sat in the back of the vehicle survived after being taken to hospital . In total , three vehicles were towed from the location , two were pickup trucks and the other was a sedan . After killing four people , Smith turned the gun on himself and shot himself in the head . He initially survived , but later died at a hospital just before 10:00 p.m . At the time , it was the deadliest shooting in the U.S. in the year 2018 , until it was surpassed by the Stoneman Douglas High School shooting just seventeen days later
Stoneman Douglas High School shooting
Stoneman Douglas High School shooting
Melcroft, Pennsylvania