Even tho I think the story the boy/girl came up with is BS- I don't think there is anything the law can do. I don't think Upchurch can be charged for anything especially if there is proof Daniel broke into the home.
IMO, I think they were shoving/fighting and Upchurch grabbed the gun. Daniel took off trying to get out of the mobile home. Upchurch was enraged and wouldn't let him.

At least the girl performed CPR on him. I found her facebook. She's a nurse. She's also friends with Upchurch (but really there is NOTHING on either of their pages)