A patrol officer on November 19, 1978, found a green Dodge pickup with a broken window and blood at a rest area off Route 5 in West Springfield, Massachusetts. Over the guardrail nearby were the bodies of 18-year-old Theresa Marcoux and 20-year-old Mark Harnish; both had been shot multiple times. Investigators concluded the couple had been shot inside the pickup truck and their bodies then moved to where they were found. Spent projectiles were recovered but no firearm was located. A latent fingerprint in blood on the passenger side window was collected but could not be matched at the time.

Theresa was an East Longmeadow High School student who worked as a hardware store clerk and was remembered as someone who loved to laugh. Mark worked at a car repair shop; he and Theresa had attended the same high school and were last seen leaving a friend’s party at about 12:30 a.m. The case went cold for decades despite periodic review. In October 2024 an individual named Timothy Joley was identified by a tip; his left thumbprint from a 2000 taxicab license application matched the latent print, and records show he was a licensed gun owner in 1978 who bought a Colt handgun the month before the killings.

Did anyone who knew Theresa or Mark then in West Springfield remember anything from that night or the days around it?