Irma C. Ruiz was a 40-year-old Chicago Police Officer who was killed in the line of duty on September 22, 1988, while responding to an incident at Moses Montefiore School in Chicago. She and her partner, Patrolman Greg Jaglowski, went to the school over a disciplinary matter and encountered a heavily armed man, 40-year-old Clemmie Henderson, who had just fatally shot multiple people at a nearby auto parts store.

After killing two people at The Comet Auto Parts, Henderson entered the school, where he shot and killed Arthur Baker, 34, wounded Laplose Chestnut, 35, and then opened fire on the officers. Officer Ruiz was struck by a bullet that penetrated her heart and died. Patrolman Jaglowski was shot in the left thigh but escaped, radioed for help, and later shot and killed Henderson at the scene.

Investigators determined Henderson acted alone and was mentally unstable. Officer Ruiz was honored posthumously; Walnut Park was renamed Irma Ruiz Park and a police horse was named for her.