Trooper Anthony Borostowski was killed in a single vehicle crash at mile marker 89 on eastbound I-90/94 in Sauk County.
He was on patrol at approximately 4:00 am when his patrol car left the roadway and struck a tree. He was pronounced dead at the scene.
Trooper Borostowski was a member of the Wisconsin Army National Guard and had served with the Wisconsin State Patrol for three years
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