Hallie Ann Seaman was 25 and a University of Washington graduate student in architecture when she disappeared on April 29, 1975. Her body was found the next day near a Seattle parking lot; she had been sexually assaulted and stabbed multiple times. Her vehicle was discovered set on fire about four miles from where her body was located.

The case stayed unsolved for decades until DNA evidence in 2023 linked convicted rapist and murderer Charles Rodman Campbell to Hallie’s assault and killing. Campbell, executed in 1994 for a separate triple murder, was posthumously identified as the perpetrator in Hallie’s case. The motive for targeting Hallie is not recorded in the available details.

Anyone who knew Hallie, her routines in 1975, or has information about that area in late April 1975 is asked to come forward.