Map: John Wayne Gacy's house
8215 West Summerdale Avenue, Chicago, IL 60656
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On December 11th, 1978, Gacy approached his final victim, Robert Piest (15), at the Nissan Pharmacy in Des Plaines.
These days, the building is home to a daycare center called Millie's House.
At the time, Piest was working part-time at the pharmacy.
Gacy, who owned a construction company called PDM Contractors, visited the pharmacy to discuss a remodeling job with the owner.
After noticing Piest, he loudly mentioned that his construction firm paid teenage boys $5 per hour—a very substantial amount back in 1975.
Later that day, Piest's mother arrived to pick him up. However, he asked her to wait a little while because he needed to talk to a contractor about a potential job.
Sadly, he never returned. Within an hour of leaving the pharmacy, the teenager was murdered at Gacy's house on Summerdale Avenue.
It was Piest's sudden disappearance that ultimately led to Gacy's arrest.