Trooper Trevor Casper, 21, was killed in the line of duty on March 24, 2015, in Fond du Lac, Wisconsin. Casper, on his first solo assignment, located Steven Snyder driving a vehicle stolen after a bank robbery and the murder of 59-year-old Thomas C. Christ earlier that day. Casper followed Snyder; the encounter ended in a parking lot where Snyder opened fire, striking Casper three times. Casper returned fire during a short shootout that lasted about 17 seconds. Snyder fired nine shots and Casper fired 12, and Casper’s return shot fatally wounded Snyder. Casper was pronounced dead en route to the hospital.

No arrests followed because Snyder was killed in the exchange. The investigation attributed multiple bank robberies across several states and the murder of Thomas C. Christ to Snyder. Officials described Casper’s actions as heroic; the community and law enforcement mourned his death, and Casper was later honored and inducted into the State of Wisconsin Fire & Police Hall of Fame.

If anyone has information about the events of March 24, 2015, or knew Trooper Casper, please share what you know.