NEED TO KNOW

John Wayne Gacy was a prolific serial killer who was convicted of 33 murders in 1980

The so-called "Killer Clown" said he murdered all of his victims in his Illinois home

He also buried most of his victims' bodies under his house

John Wayne Gacy 's modest and unassuming ranch-style house had horrors hidden underneath it.

Neighbors in Norwood Park Township, Ill., knew Gacy as a successful contractor who dressed as "Pogo the Clown" for kids' parties and children's hospital visits and was active in local politics, even once meeting First Lady Rosalynn Carter . However, beneath the makeup, amiable veneer and his seemingly normal brickfront home lurked unbelievable darkness — and a putrid odor that ultimately did him in.

In December 1978, Gacy confessed to kidnapping ,

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