In the early morning hours of May 29, 1976, the body of 21-year-old Dwayne Leroy Moulton was found in an alley near East 35th Avenue and Kearney Street in Denver’s Park Hill neighborhood. The Denver Police Department determined he had been shot to death.

Moulton had been at a local nightclub called Mr. Lucky’s in the hours before the killing and was last seen there. Exactly how he left the club and what led to the shooting in the alley remain unclear. No arrests or suspects have been publicly identified, and the case went cold.

The Denver Police Department is asking anyone with information about Moulton’s movements that night or the circumstances of the shooting to come forward.