Dan De Kraai, 35, died on September 15, 2010, in Saint Joseph, Missouri, after being struck by a firearm discharge during a St. Joseph Police Department Special Response Team training exercise. The team was running hostage rescue scenarios at the former Neely School using Simunitions, non-lethal plastic training rounds. During a break, De Kraai and another officer went to a convenience store and, before leaving the facility, switched their Simunition training weapons for their fully loaded service pistols.

When they returned and prepared to resume the drill, De Kraai asked the fellow officer to shoot him with a Simunition so he could feel the impact. The other officer, still carrying his service weapon instead of the training firearm, drew and fired one shot that struck De Kraai in the back. De Kraai was taken to Heartland Regional Medical Center and pronounced dead shortly after arrival. An investigation found the discharge was unintentional and resulted from the failure to exchange weapons after the break; the death was ruled accidental. The officer who fired was placed on administrative leave. De Kraai was survived by his wife and young daughter.