Las Vegas Sun - Photograph : John Wayne Gacy

November 19, 2017

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In this photo taken Friday, Nov. 30, 2012, in Chicago, Cook County Sheriff Tom Dart, left, and sheriff's detective Jason Moran are photographed with three recently discovered vials of mass murderer John Wayne Gacy's blood.

M. Spencer Green / AP

In this photo taken Friday, Nov. 30, 2012, in Chicago, Cook County Sheriff Tom Dart, left, and sheriff's detective Jason Moran are photographed with three recently discovered vials of mass murderer John Wayne Gacy's blood.