ST. CLOUD, Minn. -- Thursday marks four weeks since police officer Thomas Decker was killed outside a Cold Spring bar, and investigators still do not have a suspect in custody.
The police say Decker was ambushed while responding to concerns about a possibly suicidal man who lived above Winner's bar in Cold Spring.
The man was arrested, but police released him for lack of evidence.
Last week, the police held a news conference where they talked about a dark-colored van that was seen leaving the crime scene, but they were unsure if there is any link. They were also still looking for a .20-gauge shotgun they believe was used to kill Decker.
Decker's death was the first fatal shooting of a Minnesota law enforcement officer since 1970 that was not solved within a few days.
A $100,000 reward has been issued for information leading to the arrest and conviction of Decker's killer.
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