Alvin Roundtree was in custody Tuesday and his wife was in stable condition at a military hospital.
The complaint alleges that the 51-year-old carried a .45 caliber pistol onto Fort Sam Houston on Monday and got into an argument with his common-law wife. He then allegedly shot her multiple times. Federal prosecutors have charged him with domestic violence and Roundtree is scheduled to appear before a federal magistrate on Thursday.
If convicted, he could face 20 years in prison and a $250,000 fine.
Roundtree is in federal custody because the shooting took place on a military base, and the FBI is investigating.
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