"He was an angry person, violent in nature, and a bigot to almost every class of person," Dan Gilroy told CNN affiliate WPTV-TV in West Palm Beach.
The former police officer asserts that he foresaw Mateen eventually committing an act of mass violence.
Mateen's ex-wife, Sitora Yusufiy, described a brief but violent relationship to a mentally-ill man whom she was only able to escape from through her family's help.
Anti-gay sentiment The shooter's father, Seddique Mateen, of Port St.
Lucie, recalled an incident where his son reacted by a gay couple displaying affection.
A conflicting image of the Orlando nightclub shooter has emerged as investigators try to understand the man responsible for the deadliest mass shooting in U. Pulse regular Kevin West told the Los Angeles Times that Mateen messaged him on a gay dating app several times in the year before the attack.
What could have driven Omar Mir Seddique Mateen, a New York-born security guard who was the son of Afghan immigrants, to such a horrific act of violence -- the biggest terror attack on U. According to his estimate, Mateen visited Pulse twice a month over a period of three years. He didn't seem like the kind of guy who just did what he did. "My partner said that he was very nice [and seemed] comfortable." Prior visits to Pulse are a line of inquiry investigators are pursuing, sources involved in the investigation tell CNN's Jim Scuitto and Evan Perez.
Chris Callen, who worked at Pulse as a performer, told CNN's Anderson Cooper he'd seen Mateen dozens of times at the club.
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But that picture doesn't match up easily to the account of his coworkers who said Mateen was known to frequently spew anti-gay remarks.