The gunman who killed three Michigan State University students on Feb. 13 used cash and a debit card to purchase the two handguns found on him that night, with one of the weapons used during the mass shooting, according to a university official.

The shooter paid $324.99 in cash in October 2021 to buy the Taurus G3 9mm handgun from a local retailer that he used in the shooting, Dana Whyte, a spokesperson for the Michigan State University Department of Police and Public Safety, told Payments Dive by email and text message. Whyte didn’t identify the retailer.

The gunman entered the Michigan State University campus on the evening of Feb. 13, according to a press release and timeline of events posted online April 27 by the university’s police department.

He killed three students in an academic hall and the student union in the nearly one hour he spent on campus. The police events timeline showed the gunman died from a self-inflicted gunshot wound as officers approached him at about midnight on Feb. 13. In addition to killing three students, the shooter wounded five other students, who survived their injuries.

The gunman also carried a Hi-Point C-9 9mm handgun that night, similarly purchased at a local retailer, using $169.99 in cash and putting $4.56 on a debit card to buy it in September 2021, Whyte said in the text message. The university police press release said “evidence concludes” that he did not use the Hi-Point handgun during the shooting. Whyte didn’t response to a request to identify the retailer in the gun sales.

The university is located in East Lansing, Michigan, in the south-central part of the state. Police said there is no conclusive motive on why the gunman targeted the school because he had no personal or professional connection to the university, and he hadn’t applied for employment there in recent history.

The gunman watched campus shootings and other violent topics online in the days before the attack, according to a news report from the Lansing State Journal newspaper.

This is piece is part of a Payments Dive series on how active shooters pay for guns.