I can't confirm any of this report
source: https://www.everipedia.com/omar-mateen/
Omar Mateen was the shooter in the Pulse Orlando Shooting (2016). His family runs a religious non-profit called The Durand Jirga, Inc. Mateen is associated with ISIS. He hails from Port St. Lucie, Florida and was born to Afghan parents. He was a registered Democrat according to state voter records, and also possessed a concealed carry license. He has no known previous criminal record, but was reportedly on the FBI 'radar' in 2013 and 2014. The case was closed without action.
In 2006 Omar changed his name from Omar Mir Seddique to Omar Mir Seddique Mateen.