Dorcas Sue Hilton was found dead in the Arkansas River in Tulsa, Oklahoma, on February 22, 1988. Her body was recovered at 5:32 p.m. near the 3100 block of South Riverside Drive, among the rocks at the northern end of the Public Service Company of Oklahoma property. She had been bound and killed by blunt force trauma.

Dorcas was known to be unhoused, frequently staying in shelters or under bridges, and to have struggled with mental illness. She was last seen alive the same day her body was found, between about noon and 2 p.m. The circumstances of her final hours and the identity of her killer remain unknown; no arrests have been announced and the Tulsa Police Department Cold Case Unit lists the investigation as open.

Does anyone who was in south Tulsa that afternoon in February 1988 remember seeing Dorcas or noticing anything unusual near Riverside Drive?