Mary Showman, 28, was found dead inside her Denver apartment near Mississippi Avenue and South Parker Road after coworkers checked on her on May 12, 1989, when she failed to show up for work. Investigators determined she had been strangled and likely dead for several days before discovery.

Her vehicle was missing from its usual spot at the complex and was later found abandoned several blocks away, a detail that investigators note may have delayed discovery or been intended to mislead. At the time of her death she was studying for an associate’s degree and had previously worked as a server in ski resort towns before returning to Denver.

No suspects or arrests have been publicly identified and the Denver Police Department treats the case as a cold case. If anyone knew Mary, her routines, or saw her car in the days before May 12, 1989, please contact investigators with any information.