John Wayne Gacy aka "Pogo the Clown" and "The Killer Clown" was a serial killer convicted of 33 murders of which 29 victims were buried beneath his home at 8213 W. Summerdale Ave. in Norwood Park Township, Cook County Illinois. Gacy was executed by the state of Illinois on May 10, 1994.
 
8" x 10" vintage trial photo showing blood underneath the carpet.
This is an actual photo used at Gacy's trial and includese an embossed Cook County stamped seal.
TObtained from his former legal counsel. The photo shows inside in the house with the carpet pulled up showing what appears to be blood.