Federal Aviation Administration officials opened an investigation after skydiving instructor Justin Fuller died on Saturday when he separated from his student near Nashville's John C. Tune airport. Authorities found Fuller's body in a wooded area after a police helicopter search, but the circumstances behind his detachment from the tandem rig remain unknown. Firefighters rescued the surviving client from a tree where he had remained trapped for hours with the parachute still attached. Fuller had posted on Instagram in June about the rewards of teaching skydiving, and three other jumps from the same aircraft had been concluded successfully before the fatal incident.