Tracy Czaczkowski, 44, of Buffalo Grove, Illinois, was shot in the neck during a drive-by shooting on Interstate 90/94 in Sauk County, Wisconsin, on May 1, 2016. She and her family were returning from a weekend in the Wisconsin Dells; her husband was driving and their two young children were in the back seat. Tracy was pronounced dead two days later at a Madison hospital.

Authorities say the shooter, identified as 20-year-old Zachary Hays, had already killed another man, Gabriel Sanchez, earlier that day in a Milwaukee suburb and then fled with his two brothers. Hays reportedly fired three shots at the Czaczkowski vehicle from a Chevrolet Blazer, striking Tracy once. Police deployed a spike strip and shot Hays when he displayed his gun; he was later charged with first-degree intentional homicide in Tracy’s death. Jeremy Hays, a passenger and Zachary’s brother, told investigators Zachary had been acting paranoid and had threatened the brothers and pointed a .45 caliber pistol at other cars while driving erratically.

Tracy is remembered as a wife, mother and daughter; her husband Greg, who worked for the U.S. Drug Enforcement Administration, and the children received community support and a GoFundMe was created for the children’s needs. Does anyone have information about the travel route or highway sightings that day that could help clarify the timeline?