From serial killers to celebrity victims, here's a look at a handful of the most famous murder cases in recent U.S. history. Some of these crimes were committed by criminals who've been caught â??and punished. In others, questions still remain.
1. John Wayne Gacy, The Killer Clown
An entertainer who played "Pogo the Clown" at children's parties, John Wayne Gacy was one of the most infamous serial killers in America. Over just six years, beginning in 1972, Gacy tortured, raped, and murdered 33 young men, most whom were just teenagers.
Police tracked down Gacy while investigating the disappearance of 15-year-old Robert Piest in 1978. What they discovered in the crawl space under his home was gruesome. Twenty bodies of young men were found there, one was in the garage, and four more were found in the nearby Des Plaines River.
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