Omar Mir Seddique ( November 16 , 1986 – June 12 , 2016 ) , also known as Omar Mateen , was an American mass murderer and domestic terrorist who killed 49 people and wounded 53 others in a mass shooting at the Pulse gay nightclub in Orlando , Florida , on June 12 , 2016 , before he was killed in a shootout with the local police . It was the deadliest shooting by a single shooter in United States history until the Las Vegas Strip shooting on October 1 , 2017
Las Vegas Strip shooting
2017 Las Vegas shooting
Omar Mateen