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A former co-worker just named the three things that always set off Orlando shooter Omar Mateen KPIX/screenshot

While the father of the deceased perpetrator of the mass murder at a gay nightclub in Orlando, Fla. early Sunday morning says the attack “had nothing to do with religion” and law enforcement officials say he called 911 and pledged allegiance to ISIS, a former co-worker has come forward and revealed three things that always set Omar Mateen off.

RELATED: Ex-wife of gunman in Orlando terror attack says she fled his violent abuse

Daniel Gilroy, who worked with the 29-year-old Omar Mateen at G4S Secure Solutions, spoke with NBC News and described Mateen as  “conscientious” but  “scary in a concerning way […] all the time.”

Gilroy said that the things that would always “set him off” were “women, race, or religion.”

“He was scary in a concerning way,” Gilroy said. “And it wasn’t at times. It was all the time. He had anger management issues. Something would set him off, but the things that would set him off were always women, race or religion. [Those were] his button pushers.”

“[He] always referred to every other race, religion, gender in a derogatory way. He did not like black people at all. That was mentioned once or twice, but more so was women. He did not like women at all. He did like women in a sexual way, but he did not respect them,” he went on.

Gilroy said working with Mateen proved so difficult he asked to work with someone else.

“I needed to be out of that situation,” he said. “I described it as being toxic.”

The shooter’s father said that seeing two men kissing once got his son very angry and he wondered if that set him off.

“We were in downtown Miami, Bayside, people were playing music. And he saw two men kissing each other in front of his wife and kid, and he got very angry,” Seddique Mir Mateen told NBC News on Sunday. “They were kissing each other and touching each other, and he said: ‘Look at that. In front of my son, they are doing that.’ And then we were in the men’s bathroom, and men were kissing each other.”

RELATED: The mom who texted her son trapped inside the Orlando club has gotten the most heartbreaking news

Mateen’s ex-wife, Sitora Yusufiy, has come forward since news of the massacre spread and what she had to say painted a similar picture of the gunman.

She told The Washington Post that her ex-husband, who she met online, was “not a stable person,” that he beat her and was prone to snapping over unfinished chores.

“He was not a stable person,” she said. “He beat me. He would just come home and start beating me up because the laundry wasn’t finished or something like that.”

“He seemed like a normal human being,” she said.

They divorced in 2011 after four months of marriage.

Matt Naham About the author:
Matt Naham is the Weekend Editor  for Rare. Follow him on Twitter @matt_naham.
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