FILE - In this Nov. 22, 1998 file photo, a fence surrounds the yard of the apartment building where the mother of convicted serial killer John Wayne Gacy once lived in Chicago. Cook County Sheriff Tom Dart says his officers and the FBI using high tech equipment and two dogs trained to sniff out human remains, went to the apartment complex in March 2013 and found nothing to indicate the serial killer stashed any bodies there. Dart has been investigating the serial killer who was convicted in 1980 of murdering 33 young men in the 1970s on a number of fronts the last couple years. (AP Photo/M. Spencer Green, File)

Associated Press
FILE - In this Nov. 22, 1998 file photo, a fence surrounds the yard of the apartment building where the mother of convicted serial killer John Wayne Gacy once lived in Chicago. Cook County Sheriff Tom Dart says his officers and the FBI using high tech equipment and two dogs trained to sniff out human remains, went to the apartment complex in March 2013 and found nothing to indicate the serial killer stashed any bodies there. Dart has been investigating the serial killer who was convicted in 1980 of murdering 33 young men in the 1970s on a number of fronts the last couple years.  (AP Photo/M. Spencer Green, File)
FILE - In this Nov. 22, 1998 file photo, a fence surrounds the yard of the apartment building where the mother of convicted serial killer John Wayne Gacy once lived in Chicago. Cook County Sheriff Tom Dart says his officers and the FBI using high tech equipment and two dogs trained to sniff out human remains, went to the apartment complex in March 2013 and found nothing to indicate the serial killer stashed any bodies there. Dart has been investigating the serial killer who was convicted in 1980 of murdering 33 young men in the 1970s on a number of fronts the last couple years. (AP Photo/M. Spencer Green, File)
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