Trenny Lynn Gibson Missing Person Case

Jan 28, 2026

Jan 28, 2026

Trenny

Lynn Gibson

16

16

5'3 inches

115 lbs

White

Female

On a fall day in October of 1976, sixteen-year-old Trenny Lynn Gibson, a sophomore at Bearden High School in Knoxville, Tennessee, embarked on a horticulture class field trip to the Great Smoky Mountains National Park. The destination, kept a surprise from the students until they were en route, was Clingmans Dome, the highest point in the park. On October 8th, Trenny, along with about 40 of her classmates, was hiking the Forney Ridge Trail to Andrews Bald. The weather was poor, and Trenny was not dressed for a long hike, having to borrow a heavy brown plaid jacket from a male classmate, Robert Simpson. She was last seen at approximately 3:00 p.m. that day, on a section of the trail known for its steep drop-offs and dense undergrowth. Accounts from her classmates suggest she was walking at a faster pace than the others, seemingly in a hurry to get back to the bus. She was with a small group of friends who stopped to rest, and she decided to continue on alone; she was never seen again. The disappearance of Trenny Lynn Gibson triggered an extensive search and investigation. For weeks, hundreds of volunteers, law enforcement personnel, and park staff scoured the rugged terrain. Tracking dogs were brought in and managed to pick up her scent, leading them from the trail intersection with the Appalachian Trail towards the Clingmans Dome observation tower and then along the roadside for about a mile and a half before the scent vanished. This led investigators to believe she may have made her way out of the park by vehicle. The FBI launched an investigation on October 12, 1976, but their complete case file has never been publicly released. Despite numerous searches of the area in the years that followed, no physical evidence connected to Trenny, such as her clothing or remains, has ever been discovered within the park. Her purse, containing her money and personal items, had been left at home, which to many, suggested she did not plan to run away. Over the decades, several theories have emerged in the absence of concrete answers. Foul play is strongly suspected, with the FBI considering the possibility that she was abducted from the park. Suspicion has fallen on various individuals over the years. One person of interest was a fellow student who had previously been involved in an incident at the Gibson home and had allegedly made threats against Trenny. However, school records indicated he was in class on the day of the field trip. Another classmate, Robert Simpson, who loaned Trenny his jacket and with whom she sat on the bus, also came under scrutiny after Trenny's comb was found in his car and he made some unusual statements to her sister. The discovery of Trenny's distinctive sapphire ring and a pendant in the possession of another student after her disappearance added another layer of mystery, though how the student obtained them was never clarified. The case remains one of the most haunting unsolved disappearances associated with the Great Smoky Mountains National Park, leaving her family and community with unanswered questions for nearly five decades.

Oct 08, 1976

Great Smoky Mountains National Park

Tennessee

Great Smoky Mountains Nat

Tennessee Bureau Of Investigation

615-744-4000

06/09/2026