BUFFALO, Minn. (AP) – A man arrested but not charged in the killing of Cold Spring Police Officer Tom Decker has pleaded guilty to stalking his ex-girlfriend in Wright County.

The St. Cloud Times reports 34-year-old Ryan Michael Larson pleaded guilty Tuesday to the felony stalking charge. Sentencing is scheduled for May 7.

Larson was accused of a pattern of stalking that included calling his ex-girlfriend’s employer and trying to get her fired.

Larson was arrested Nov. 29, the night Decker was shot to death behind a bar in Cold Spring. He spent four days in jail as a suspect in that killing before being released without being charged. He has maintained his innocence and said he had nothing to do with Decker’s death.