Gacy had previously been convicted in 1968 of the sodomy of a teenage boy in Waterloo, Iowa, and was sentenced to ten years' imprisonment, but served eighteen months. He murdered his first victim in 1972, had murdered twice more by the end of 1975, and murdered at least thirty victims after his divorce from his second wife in 1976. The investigation into the disappearance of Des Plaines teenager Robert Piest led to Gacy's arrest on December 21, 1978.
Gacy had previously been convicted in 1968 of the sodomy of a teenage boy in Waterloo Iowa and was sentenced to ten years' imprisonment but served eighteen months He murdered his first victim in 1972 had murdered twice more by the end of 1975 and murdered at least thirty victims after his divorce from his second wife in 1976 The investigation into the disappearance of Des Plaines teenager Robert Piest led to Gacy's arrest on December 21 1978