GATLINBURG, Tenn. (WATE) — June 14 will mark 56 years since Dennis Martin disappeared in the Great Smoky Mountains National Park. The quiet boy from Knoxville was just a few days away from his 7th birthday the last time he was seen.

More than five decades after Dennis Lloyd Martin's disappearance, 6 News obtained the National Park Service's case file, which details how the search for the boy was conducted after he vanished from Spence Field.

The weekend of Father's Day 1969, Dennis Martin was in the Great Smoky Mountains National Park on a trip with a group, which included his father, grandfather, and 9-year-old brother, the case files revealed. The group was in the area of Spence Field, along the Appalachian Trail, after staying the night at a shelter cabin on the west end of the field.

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