206 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.
Case Description
Any updates on this case?
In the pre-dawn hours of November 19, 1978, the quiet of a rest area off Route 5 in West Springfield, Massachusetts was shattered by an act of brutal violence that would leave a community shaken and a mystery unsolved for decades. It was there that a patrolling officer discovered a green Dodge pickup truck with a damaged window and blood in and around it. The grim discovery led the officer over a nearby guardrail where the bodies of 18-year-old white female Theresa Marcoux and 20-year-old Mark H ...Read More
Links to Additional Sources (9)
See any mistakes?Victim Details
Theresa Marcoux
Female
White / Caucasian
West Springfield
MA
1978-11-19
18
Theresa
Marcoux
11/08/2025
Forum Posts (1)
I’ve been following the case of Theresa Marcoux and Mark Harnish for a while, and can't seem to sh... ...Read More
02/16/2023
02/16/2023
