The man who police say shot and killed 26 people in a Texas church was sentenced to a year behind bars for fracturing his infant stepson’s skull and assaulting his wife in 2012, according to new information from the Air Force.

"He assaulted his stepson severely enough that he fractured his skull, and he also assaulted his wife," Don Christensen, a retired colonel and chief prosecutor for the Air Force, told the New York Times. "He pled to intentionally doing it."

Devin Patrick Kelley, 26, was sentenced to 12 months in confinement and had his rank reduced, then was discharged from the military under a bad conduct discharge.

Federal authorities on Monday were still reviewing whether the bad conduct discharge should have barred Kelley from purchasing the three guns found in his vehicle after he opened fire at the First Baptist Church in rural Sutherland Springs on Sunday. Kelley was found dead in his vehicle several miles from the shooting.

“Until we can get all the documentation to determine exactly what his discharge and conviction in the military [were], we will not have a determination on if this individual was prohibited from possessing or purchasing firearms,” Bureau of Alcohol, Tobacco, Firearms, and Explosives field agent Fred Milanowski said.

Police said the gunman's former in-laws sometimes attended services at First Baptist but were not there the day of the shooting. The 26 victims ranged in age from 18 months to 77 years old. Twenty other people were injured in the attack.