We're learning new information about the gunman who killed 49 people and injured 53 others at a gay nightclub in the worst mass shooting in U.S. History. An unidentified man who claims he was Omar Mateen's lover. He believed Mateen, twice married to women, was enraged after a sexual encounter with two men. One later revealed he was HIV positive. In a 911 call during the shooting rampage, Mateen pledged solidarity with the Islamic State group. He was killed by police following a 3 hour siege. #InsideEdition
