On May 4, 1978, a mother visiting her son’s home at 1801 S. 91st E. Avenue in Tulsa, Oklahoma, found Mark Alfonso dead inside. Investigators determined Alfonso had been fatally shot and treated the event as a homicide.

The case was investigated by the Tulsa Police Department but later went cold; no arrests have ever been announced and the identity of the shooter or shooters remains unknown. Little public information has been released about motive or persons of interest, and key details about what happened in the moments before the shooting remain elusive. If anyone has information about Mark Alfonso, the scene at 1801 S. 91st E.

Avenue on or around May 4, 1978, or contacts who may have known him then, please share what you know with the Tulsa Police Department.