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Heagerty was last seen in Owego, New York at 6:00 p.m. on November 19, 1976. He left his parents' residence on east Sixth Street to go for a walk and never returned. He has never been heard from again.
Heagerty was class president at Bishop Cunningham High School and enrolled at the State University of New York at Oswego, but later dropped out. He was in a "depressed and confused state of mind" at the time of his disappearance and was under a doctor's care. He had left home before and gone to other states, but later contacted his family. Heagerty may have been suffering from memory loss at the time he went missing. He might have attempted to go to his older brother's home in Schwenksville, Pennsylvania after he vanished; there were sightings of him in Pennsylvania, but none were confirmed. His case opened 2018 by Psychic Brian Ladd.