Omar Mateen appeared in an award-winning 2012 documentary about the 2010 BP oil spill, four years before he killed 49 people and injured dozens more at Orlando’s Pulse nightclub in the deadliest mass shooting in U.S. history.

In 2010, The Big Fix filmmaker Rebecca Tickell recorded Mateen on a hidden camera while he was working as a guard for security company G4S — and he was extremely angry about the cleanup efforts for the spill.

“No one gives a s--t here,” he says during a 40-second appearance in the documentary. “Everybody’s just out to get paid. They’re, like, hoping for more oil to come out and more people to complain so they’ll have jobs. 'Cause once people get laid off here, it’s gonna suck for them. They want more disaster to happen 'cause that’s where their money making is. All about the money.”

A G4S spokesperson confirmed to CBS News on Wednesday, June 15, that Mateen is the man featured in the clip. The Big Fix investigated the April 2010 oil spill in the Gulf of Mexico that followed the sinking of the Deepwater Horizon oil rig.

As previously reported, Mateen worked several jobs as a security guard prior to committing the June 12 massacre at Pulse nightclub. In 2013, he worked as a security guard at the St. Lucie County Courthouse in Fort Pierce, Florida. He was later removed from the job after he “boasted of ties” to terrorist groups, according to a report by The New York Times.

As a result, the gunman was under investigation by the FBI for a 10-month period, but the inquiry was ultimately closed after the security service determined that Mateen did not appear to be a threat.

FBI officials are now investigating Mateen’s second wife, Noor Zahi Salman, after she reportedly revealed that she tried to talk him out of the Orlando attack. She also claims that she once drove him to Pulse nightclub to “scope out” the place, in addition to going with him to buy ammunition and a holster.

Can't get enough of Us? Sign up now for the Us Weekly newsletter packed with the latest celeb news, hot pics and more!