Texas gunman Devin Kelley escaped from mental health facility in 2012

The gunman accused of the worst mass murder in Texas history escaped from a mental health hospital during his stint in the Air Force, according to a 2012 police report.

Police took Devin Kelley into custody on June 7, 2012 at a bus terminal in downtown El Paso, Texas, where he had planned to flee by bus after breaking out of Peak Behavioral Health Services, some 10 miles away in New Mexico, according to NBC Houston affiliate KPRC. Kelley, who was 21 at the time of the escape, had been sent to the facility after he was accused of assaulting his wife and infant stepson.

A witness told El Paso officers that Kelley "was a danger to himself and others as he had already been caught sneaking firearms onto Holloman Air Force Base," where he was stationed at the time, according to the police report obtained by KPRC. He "was attempting to carry out death threats" he had made against his military superiors, the report said.

RELATED: What we know about the Texas church shooter

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What we know about Texas church shooting suspect Devin Kelley
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What we know about Texas church shooting suspect Devin Kelley

Devin Patrick Kelley is accused of killing more than two dozen people in a shooting at the First Baptist Church in Sutherland Springs, Texas.

(Texas Department of Safety/Handout via REUTERS)

The 26-year-old live in this home in New Braunfels, Texas.

(REUTERS/Jonathan Bachman)

He was a member of the U.S. Air Force before discharged and court-martialed for reportedly assault his first wife and child.

(Photo by Ian Hitchcock/Getty Images)

Officials said Kelley was involved in a domestic dispute with the family of  a woman he married in 2014.

(Photo by Erich Schlegel/Getty Images)

He worked at Schlitterbahn Waterpark and Resort.

(Photo by Erich Schlegel/Getty Images)

Kelley used an AR-556 rifle and wore tactical gear during the attack, according to authorities.

(Photo Illustration by George Frey/Getty Images)

Two ex-girlfriends told NBC News that Kelley stalked them after breakups.

(Photo by Scott Olson/Getty Images)

Devin Patrick Kelley attended high school at New Braunfels High School.

(Photo by Erich Schlegel/Getty Images)

Authorities said Kelley called his father during the chase to say he had been shot and might not survive. He was later found dead in his vehicle. 

(Photo by Scott Olson/Getty Images)

A former schoolmate of Kelley told Reuters that he shared posts on Facebook about atheism and his assault weapon in recent years.

(Daniel Acker/Bloomberg via Getty Images)

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Air Force spokeswoman Ann Stefanek has confirmed that Kelley — who joined the military after graduating from New Braunfels High School in 2009 — was court-martialed in 2012 on two charges of assault.

Related: Senators Call for Probe After Military Error Let Texas Gunman Buy Weapons

A retired Air Force colonel who supervised prosecutors when Kelley was brought before the court-martial said Kelley was convicted of fracturing his baby stepson's skull and assaulting his first wife, Tessa, in the incident at Holloman.

He was confined for a year, given a bad conduct discharge and reduced in rank to E-1, or airman basic, Stefanek said. The military failed to enter the domestic violence case into a database that would have made it illegal for him to buy a gun, officials said.

Kelley slaughtered 26 people Sunday inside First Baptist Church in Sutherland Springs, Texas, authorities said. A Glock and a Ruger handgun were discovered inside a Ford Expedition where Kelley's body was found after a chase following the shooting, authorities said, and a Ruger AR-556 rifle was recovered at the church.

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