LAVACA COUNTY, Texas -- A 14-year-old boy was accidentally shot and killed in a hunting accident by his grandfather, investigators said.

According to the Lavaca County Sheriff's Office, Taylor Michalec's grandfather said he was walking behind the teen when the trigger on his AK-47 assault rifle snagged a branch and discharged, striking the teen in the back.

The shooting happened Wednesday afternoon near County Road 290, about five miles west of Moulton, Texas, about 100 miles east of San Antonio.

Both his father and grandfather tried to administer CPR, but when EMS responders arrived, the teen was pronounced dead. Michalec had just completed his freshman year at Steele High School, where he was a member of the football team.

Lavaca County investigators said they will not file any charges on the boy's grandfather because the shooting appeared to be an accident.