Omar Mir Seddique Mateen was an American terrorist and mass murderer who murdered 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 Las Vegas Strip shooting on October 1, 2017.

On June 12, 2016, 29-year-old Omar Mateen shot and killed 49 people and wounded 53 more in a mass shooting at Pulse, a gay nightclub in Orlando, Florida, United States before Orlando Police officers fatally shot him after a three-hour standoff.