Anson Isaacson, 56, was one of three employees killed in a workplace shooting at Marvin Glass and Associates in Chicago on June 27, 1976. Isaacson was a managing partner at the toy design firm known for creations such as Lite-Brite and Rock ’Em Sock ’Em Robots. Colleagues Joseph Callan and Kathy Dunn were also killed; two other employees were seriously wounded.

Authorities identified 33-year-old designer Albert Keller as the sole perpetrator. Keller was reported to have been suffering from paranoid delusions; he shot the victims during the attack and died at the scene. The company lost key personnel and faced the legal and emotional fallout while families mourned the victims and sought to honor their memories.

What further details do readers have about Isaacson’s role at the firm or the coworkers who were lost that day?