Dennis D. Denny Steinhoff, 73, was killed on the evening of December 26, 2020, in the mass shooting at Don Carter Lanes in Rockford, Illinois. Born July 26, 1947, in Cuba City, Wisconsin, he was the son of Clifford and Dorothy Johns Steinhoff, graduated from Cuba City High School in 1966, married Laura Lesperance on June 19, 1971, and retired from Daimler Chrysler in 2001 after 35 years. A U.S. Army Vietnam veteran, he was also a basketball referee for more than 40 years and a long-time member of the Illinois High School Association. Family and community members remembered him for his sense of humor and kindness.

The attack that night left three people dead, including Steinhoff, and injured others. Authorities described the shooting as appearing to be random, with no known connection between the accused and the victims. An open question remains about motive and the sequence of events inside the bowling alley; anyone who was there that evening or knew Steinhoff and has information is asked to come forward.