On August 7, 1977, four people were found shot to death in a home in Gaston, Oregon: 6-year-old Sylvia May Compton, her twin sister Sandra, their 24-year-old mother Margo Compton, and Margo’s 19-year-old boyfriend Gary Seslar. Each victim had been shot in the head in what was described as an execution-style killing.

Investigators early on focused on a retaliatory motive tied to Margo Compton’s testimony against several members of the Hell’s Angels in a San Francisco prostitution trial. Authorities identified members of the motorcycle club as primary suspects, and the investigation later narrowed to two individuals allegedly connected to the club’s Vallejo chapter leadership.

The slayings left a small community reeling. Does anyone have information about the Compton family, their life in Gaston in 1977, or leads that were provided to investigators at the time?