On the evening of September 12, 1985, the body of 32-year-old Mary Anne Deragon was found near the tree line between the Riverton School and Farnham Street in Portland, Maine. She had been living in Windham and was visiting family in Portland at the time. For years authorities did not publicly disclose a cause of death; about a decade later a former police chief said Deragon had been strangled.

The case grew cold and remains the oldest unsolved homicide in Portland. The Portland Police Department has kept the investigation open, periodically asking the public for information. No arrests have been announced and no suspects have been publicly identified.

If anyone knew Mary Anne, was in that neighborhood on September 12, 1985, or has any information that could help, please come forward to the Portland Police Department.