 Complete the following phrase:  Omar Mir Seddique Mateen born Omar Mir Seddique; November 16, 1986  June 12, 2016 was an American mass murderer and domestic terrorist who killed 49 people and wounded 53 others in a mass shooting at the Pulse 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 