On a November afternoon in 1998 in Saint Joseph, Missouri, Officer Bradley Thomas Arn, 28, was killed while responding to an active shooter call near 22nd and Calhoun streets. Arn, a six-year veteran of the St. Joseph Police Department and a Gulf War veteran, arrived first and was struck by gunfire through his patrol car door before he could exit, suffering fatal wounds.

The shooter, described as wearing camouflage and armed with an assault rifle, a shotgun and a revolver, fired indiscriminately at people and property and wounded three civilians. Officers converged on the scene and cornered the gunman in a church backyard, where he was fatally shot by another officer. Investigators later reported the shooter had fired at least 164 rounds and had a documented history of mental illness. No other suspects were involved.

Officer Arn left behind a wife and twin daughters.