On April 20, 1996, the members decided to vandalize Riverdale High School and set the auditorium on fire. While the others remained outside, Foster, Black, and Torrone entered the high school and stole staplers, canned goods, and a fire extinguisher to enable them to break into the auditorium.
Around 9:30 p.m., Riverdale’s band teacher, Mark Schwebes, arrived at the auditorium and confronted the group. Schwebes seized the stolen items and told them that he would report the incident to the campus police the next day. Schwebes then left to have dinner with a friend, David Adkins.
Black declared that Schwebes “has got to die,” to which Foster replied that if Black could not do it, he would.
At 11:30 p.m. Black, Shields, Magnotti, and Foster when to Schwebes’ house. Foster and Shields walked to the door, and Foster hid as Shields knocked on the door. When Schwebes answered the door, Foster stepped between Schwebes and Shields and shot and killed Schwebes.