And a former co-worker of 29-year-old Omar Mateen, who authorities say killed 49 people in a massacre at an Orlando gay nightclub early Sunday, claimed he saw the attack coming.
"He was an angry person, violent in nature, and a bigot to almost every class of person," said Dan Gilroy, who was a security guard alongside Mateen for about a year between 2014 and 2015, according to CNN affiliate WPTV-TV.
Gilroy, a former police officer, said Mateen's behavior was so concerning that he quit working with him.
http://www.cnn.com/2016/06/13/us/orlando-shooter-omar-mateen/index.html
One TV report said his co workers did report him but FBI cleared him twice.