Investigators are trying to figure out whether a Ravenel man’s fatal shot to the forehead was accidental.

Charleston County Sheriff’s authorities found 64-year-old Robert Horning shot in his Drayton Street home Sunday lying face down in one of the home’s rooms, according to an incident report.

Another man who was inside the home called 911 when he heard a gun shot, went into the room and found Horning laying on the floor. Horning was transported to Medical University hospital in critical condition.

Horning died on Dec. 31, according to Charleston County Sheriff’s Office Major Jim Brady. The incident remains under investigation.