Besides Blake and Morrison, Forrest remains the prime suspect in the disappearances and murders of at least five teenagers and young women. In each case, the perpetrator exhibited a similar
modus operandi to Forrest: •
Jamie Rochelle Grissim (16) was a student at
Fort Vancouver High School who disappeared while walking home from school on December 7, 1971. During the subsequent search for her, policemen found a number of her personal belongings, including her purse and an ID card, in Dole Valley. Since Morrison was later found buried not far from where her personal belongings were found, local authorities have reassessed their conclusions and now believed that Grissim was abducted and killed by Forrest. •
Barbara Ann Derry (18) went missing on February 11, 1972. She was last seen on a highway trying to hitchhike from Vancouver to
Goldendale, where she had moved to attend college. Her body was discovered on March 29 at the bottom of a silo inside the Cedar Creek Grist Mill. Derry had died from a stab wound to her chest area. Coincidentally, Derry's body was found near the area where a large manhunt had been underway for "
D. B. Cooper", an unidentified skyjacker who parachuted from a plane with a $200,000 ransom and whose ultimate fate remains unknown despite extensive investigations. •
Diane Gilchrist (14) went missing on May 29, 1974. A ninth grade student at the Shumway Junior High School who had never exhibited problematic behavior, Gilchrist's parents claimed that she had left their home in downtown Vancouver through her bedroom window on the second floor and then vanished into the night. She has never been found, and her fate remains unclear. •
Gloria Nadine Knutson (19) was last seen on May 31, 1974. A senior at
Hudson's Bay High School, Knutson had been invited to a
housewarming party but declined, opting to instead visit a downtown Vancouver nightclub called "the Red Caboose", where she was seen by several acquaintances. One witness told police that Knutson sought his help in the early morning, claiming that somebody had attempted to rape her and was now stalking her. The man claimed that she had asked him to drive her home, but his car was out of gas. Distraught, Knutson decided to walk home and disappeared soon after. Her skeletal remains were discovered by a fisherman in a forested area near
Lacamas Lake on May 9, 1978. •
Carol Platt Valenzuela (20) went missing on August 4, 1974, while hitchhiking from Camas to Vancouver. A married mother of two infant children, she was not known to be involved in prostitution or to have a
criminal record. On October 12, her skeletal remains were discovered by a hunter in the Dole Valley outside of Vancouver, very close to those of Morrison. Due to this, authorities believe that Forrest likely killed both. == References ==