Dean Heagerty was 19 when he left his family home on East Sixth Street in Oswego, New York, for a short walk on the evening of November 21, 1976, and was never seen again. He wore a dark green corduroy jacket, green fatigue pants, blue sneakers, and a knitted hat described as either brown or blue. At the time he was 6 feet 1 inch and about 140 pounds, with blond, shoulder-length hair and blue eyes.

Dean had struggled after enrolling at the State University of New York at Oswego, dropping out amid depression, confusion and memory loss; he had been hospitalized for a nervous breakdown and was under a doctor’s care. He had left home before but always contacted his family. Investigators looked into unconfirmed sightings in Pennsylvania and the possibility he was trying to reach his older brother in Schwenksville, Pennsylvania. The Oswego City Police Department keeps the case open and has developed a DNA profile from family members to check against national databases, but there has been no match.

What information might help clarify whether Dean left of his own accord, had an accident, or was a victim of foul play?