Angela Jean Monhollen was 23 and a mother of four when she disappeared on August 6, 1989, while driving to a late-night nursing home shift in Tulsa, Oklahoma. Her truck reportedly ran out of gas on the Gilcrease Expressway and she is believed to have tried to hitchhike; she was last seen that night and reported missing the next day by her boyfriend after failing to arrive for work.

Searchers found her purse on a road a few miles from the abandoned truck. On August 14 a city employee discovered partially decomposed human remains in a grassy ditch on the east side of Yale Avenue, about three miles from where the vehicle had been left; the remains were later identified as Angela through forensic evidence and tattoos. Investigators believe she may have been strangled, though an official cause of death was not determined.

On August 11, a fire later ruled arson damaged part of her residence. No arrest or resolution is noted in this account, and the Tulsa Police Department is seeking information. If anyone knew Angela or saw her vehicle or anyone suspicious in the Gilcrease Expressway or Yale Avenue area that week, please come forward with what you remember.