A driver, arrested on suspicion of driving under the influence (DUI), crashes into the Oklahoma State Homecoming parade in Stillwater, Oklahoma, killing four people and injuring 34.

The 2015 Oklahoma State University homecoming parade attack occurred on October 24, 2015, in Stillwater, Oklahoma, when Adacia Avery Chambers drove her sedan into a crowd watching the homecoming parade for Oklahoma State University–Stillwater on the university's campus. Four people were killed in the crash, and 46 others were reported injured. Chambers pled no contest to second-degree murder and assault charges, and was sentenced to life imprisonment.