(CNN) A picture is starting to emerge of the suspected gunman in a deadly mass shooting at First Baptist Church in Sutherland Springs, Texas.

Two law enforcement sources briefed on the investigation identified the shooter as Devin Patrick Kelley, 26.

Kelley was once a member of the US Air Force, spokeswoman Ann Stefanek said. He served in logistics readiness at Holloman Air Force Base in New Mexico, starting in 2010.

Devin Patrick Kelley, 26, killed 26 people at a Texas church, police say.

Kelley was court-martialed in 2012 for two counts of Article 128 of the Uniform Code of Military Justice, assault on his spouse and assault on their child, Stefanek said. Kelley received a bad conduct discharge, confinement for 12 months and a reduction in rank, she said. The Air Force did not provide a date of the discharge.

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