Officials say Aniah Blanchard was killed by a gunshot ... and now, they're seeking the death penalty for her alleged killer.
Blanchard's body was recovered in a wooded area in Macon County, Alabama on Nov. 25 after she had gone missing for weeks.
The medical examiner conducted an autopsy and determined Blanchard -- the stepdaughter of UFC fighter Walt Harris -- was killed by a gunshot ... but didn't specify to which part of her body.
Now, prosecutors say the man accused of pulling the trigger -- Ibraheem Yazeed -- is being charged with capital murder, and they're seeking the death penalty.