In 2012 and 2013, Diane Staudte and her daughter Rachel were convicted for poisoning three family members in Springfield, Missouri. Diane used ethylene glycol, a toxic chemical found in antifreeze, to kill her husband Mark and son Shaun, and attempted to kill her daughter Sarah. Mark died in April 2012, Shaun in September 2012, and Sarah was hospitalized in June 2013 with severe organ failure but survived. Investigators became suspicious due to the unusual pattern of deaths and Diane’s unemotion