Orlando Nightclub Massacre: New Video Reveals Voice of Gunman

Omar Mateen can be heard in a documentary discussing his work as a security guard at the site of the 2010 BP oil spill.
2:39 | 06/16/16

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Transcript for Orlando Nightclub Massacre: New Video Reveals Voice of Gunman
We turn to the other big story in Orlando, the president heading there this morning as the FBI now investigates that deadly shooting. They have released this poster asking the public for information about the gunman as new terrifying video shows the moments in the nightclub in a bathroom stall. ABC's Linzie Janis is in Orlando with more. Good morning, Linzie. Reporter: We've heard so many horrifying stories from inside that nightclub and now for the first time one survivor sharing with us a video he took from inside the bathroom where he was hiding. Chris, Chris. Shhh. Reporter: This morning, new video from inside the Orlando nightclub massacre. So I ended up in the bathroom. The shooter started saying everyone come out, everybody is going to die. Reporter: Instead Miguel says he and dozens of others hid in the stalls huddling together for four hours. The footage obtained by ABC station WPLG shows them passing around a cup of water and trying to keep the wounded alive. Chris, Chris. Reporter: Also this morning, for the first time the voice of the killer. Good morning. Do you have a badge? Reporter: A disgruntled omar Mateen seen in this documentary called "The big fix" working as a security guard at the site of the 2010 BP oil spill. No one gives a -- everybody is just out to get paid. All about the upon, right? Reporter: Years later his behavior would cost him his job at a Florida courthouse. There was made about his allegiance to the ft. Hood shooter and those comments brought immediate alarm to my staff and their supervisors at the courthouse. Reporter: The incident triggering one of two FBI investigations. Both concluding he was not a threat. And just last year a local police academy rejected Mateen's application, inside Mateen admits he was dismissed from another job at the Florida department of corrections, that he had used steroids and had a criminal record that was sealed or expunged. Authorities say Mateen filed a complaint claiming he was turned away because he was a Muslim. And right now the FBI is aggressively investigating Mateen's wife Noor Salman who lived here with him. They are looking into her life with as much scrutiny as her husband's. Amy. All right, thank you for that.

This transcript has been automatically generated and may not be 100% accurate.

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