Alleged gunman's social media posts during Thousand Oaks massacre

The former Marine reportedly wrote, "I just thought ... life is boring so why not?"
2:19 | 11/10/18

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Transcript for Alleged gunman's social media posts during Thousand Oaks massacre
The wildfire in southern California burning just miles from that mass shooting at a country music dance bar. First responders going from one tragedy to the next. That's just awful there. And we are learning about the alleged gunman's social media postings during the attack. ABC's Marci Gonzalez joins us from Thousand Oaks, California, with more on that. Marci, good morning. Reporter: Whit, Eva, good morning. You mentioned how close that fire was. We can smell the smoke still here at the scene. You can see it's still blocked off as investigators now focus on piecing together second by second how this tragedy unfolded. This morning investigators reviewing evidence they say is giving them new, disturbing insight into the mind of a mass shooter. Sources say the gunman who killed 12 people here at the borderline bar and grill in southern California Wednesday night paused between gunshots to text or post on social media. At 11:24 P.M. Just minutes after shooting employees at the front door, he reportedly wrote, I just thought life is boring, so why not. Investigators say they believe after that pause, he began shooting people near the dance floor then realized law enforcement had arrived and waited by the front door, immediately shooting sergeant rob helus when he walked in. A friend who served with the gunman in the Marines says he may have suffered from PTSD. Something changed in those years of being in the Marines as far as I could tell. Reporter: One of the killer's social media posts at 11:27 P.M. Reading, the only thing you people do after these shootings is hopes and prayers or keep you in my thoughts every time and wonder why these keep happening. All 12 victims now identified and overnight survivors, some who watched their friends die here, emotionally returned to the scene. I don't even want to go near it at all. It's just like so scary and like I'm like shaking thinking about it and like holding in tears and like it's just so much to think about. Reporter: They're here hoping to pick up their vehicles that were still in the parking lot and we're now learning that the funerals for the victims may be delayed because of those fires burning nearby. Dan, Eva, back to you. Just can't get more awful. Yeah, thanks, Marci.

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

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