WAUKESHA, Wis. -

The Waukesha Police Department has found that officers acted appropriately when they did not detain a man later accused of killing three Wiota residents.

Jaren Kuester had dropped off his dead puppy at the Humane Animal Welfare Society in Waukesha, then returned two weeks later believing it was alive. When he learned his puppy had been cremated, he allegedly threatened staff members, who called police.

Kuester was arrested on an unrelated municipal warrant. A criminal complaint said after being released on bail, he drove to Lafayette County and killed three people.

Waukesha Police Capt. Ron Oremus released the results of the department's investigation Wednesday.

The Milwaukee Journal Sentinel reported Oremus said in an email that Kuester had acted strangely, but added that's not unusual for people with mental illness.