David Cook was 24 when he was murdered inside the Colorado State Penitentiary in Cañon City. His body was found behind a tier of cells on April 30, 1977, having been beaten and strangled. The violent discovery prompted an internal investigation at the prison.

Two inmates were identified by witnesses early on and drew strong suspicion, according to the prison investigator general Mike Rulo. Marvin Gray, housed in the same cellblock and already serving a sentence for a 1975 Denver murder, was also considered because of his violent history and later confessions to multiple killings. Authorities were unable to develop sufficient evidence to charge Gray, and the case against him never materialized.

The murder of David Cook remains officially unsolved and no one was definitively identified or held accountable. Does anyone with knowledge of the Colorado State Penitentiary in 1977 or those inmates remember details that could help clarify what happened to David Cook?