Michael Mattson, 35, was found with multiple gunshot wounds and died at the scene in Redding, California, on November 15, 2014. Investigators determined he had been involved in a confrontation earlier that evening that escalated into a fatal shooting.

The Redding Police Department and the Shasta County Sheriff’s Office Major Crimes Unit treated the case as a high priority, questioned several people, and pursued intensive investigative work. Despite those efforts, no immediate arrests were made and the investigation went cold after several months. Detectives have periodically reviewed leads and offered rewards for tips.

The murder remains unsolved and the investigation is still open. If anyone has information about Michael Mattson’s death or the events of November 15, 2014, please come forward to law enforcement.