09/27/2026
Robert Piest was John Wayne Gacy’s final victim. His disappearance helped bring the truth to light.
On December 11, 1978, 15-year-old Robert disappeared after leaving his job at a Des Plaines pharmacy to speak with Gacy about potential work. His family immediately pushed for answers, and the investigation led police to Gacy’s home, where evidence connected Robert to the property.
That investigation ultimately exposed the extent of Gacy’s crimes and led to the discovery of dozens of other victims.
At Serial Killer: The Exhibition, their names and stories are part of the history we cannot leave out.