Authorities work to determine Texas church shooter's motive

The suspect, Devin Kelley, 26, was a former member of the Air Force who wore black and a bulletproof vest when he allegedly entered a church and killed 26 people.
2:36 | 11/06/17

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Transcript for Authorities work to determine Texas church shooter's motive
A clear picture of the gunman is now even merging, a 26-year-old father who received a bad conduct discharge from the air force. Investigators searching his home and social media accounts for clues about his past and motive. Our senior justice correspondent Pierre Thomas is in Washington with more on what they've learned. Good morning, Pierre. Reporter: Robin, good morning. Overnight police continue to look for ties between the suspect and the church. Including if he had family members that attended. But the picture emerging is of a man with a troubled past whose simmering anger about religion exploded in a massacre at a house of worship. This suspect identified to ABC news as Devin Kelley, 26, seen here in this Facebook photo. A former member of the U.S. Air force. A man who appeared at this Texas church armed to the teeth and ready to commit mass murder. The suspect dropped his rifle which was a Ruger ar assault-type rifle. There were multiple weapons in the vehicle. Reporter: Kelley posting a picture of an assault rifle on his Facebook page. He was dressed in black wearing a bulletproof vest shooting innocent victims at close range in that tiny church. Based on these images from inside the church taken two weeks ago, you can see the parishioners had nowhere to hide and little chance of escape. Overnight the FBI and local police descending on Kelley's home in new braunfels, Texas, outside of San Antonio. Neighbors expressing shock. Not a clue. I mean, no indication to me. I mean just regular old people. Reporter: Those who lived near Kelley said he liked to shoot his guns including at odd times. We hear a lot of gunfire and a lot of times at night. And I mean we'relut in the country. It's fine to shoot your guns but not at 10:00, 11:00 at night. Reporter: Here he appears to have anger issues after serving a year in prison for an assault on his spouse and 11-month-old child Kelley received a bad conduct discharge from the air force in 2014. A family member telling ABC news last night that the former volunteer at vacation bible school is now an atheist who doesn't like church and a former classmate tells ABC news he hated religious people. And that social media post from yesterday showed he was in a bad place. Pierre, there are so many questions. With his conviction and with his discharge from the military, how in the world was he able to buy a gun? Reporter: Robin, in theory someone with a domestic violence conviction should have been banned from buying a gun. But sources tell ABC news that Kelley's domestic violence conviction may not have been entered into the FBI national data base for gun background checks. If that's true, authorities will want to know why, robin. All right, Pierre. That database has not been well funded.

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

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