COLD SPRING, Minn. — The criminal investigation into the 2012 killing of a Cold Spring police officer is being closed.

Officer Thomas Decker was shot and killed on Nov. 29, 2012 after he was called to check on someone.

Ryan Larson was arrested hours later, but was never charged.

Authorities later questioned Eric Thomes as a person of interest, but Thomes committed suicide. The shotgun linked to Decker's death was found on property Thomes could access.

Stearns County Chief Deputy Sheriff Jon Lentz tells the St. Cloud Times that Thomes was the focus of the investigation, and it's time to close the case.

Larson has sued Stearns County and others, alleging his rights were violated. His attorney says closing the case will help Larson's civil claim, and is essentially an admission that Larson's innocent.