FILE - This 1978 file photo shows serial killer John Wayne Gacy. Cook County Sheriff Sheriff Tom Dart plans to provide an update on a years long effort to identify unnamed victims of Gacy Wednesday, July 19, 2017 in Chicago. Dart will discuss the investigation that he launched in 2011. His office exhumed the skeletal remains of eight of at least 33 young men Gacy stabbed or strangled in the 1970s. (AP Photo/File)
FILE - This 1978 file photo shows serial killer John Wayne Gacy. Cook County Sheriff Sheriff Tom Dart plans to provide an update on a years long effort to identify unnamed victims of Gacy Wednesday, July 19, 2017 in Chicago. Dart will discuss the investigation that he launched in 2011. His office exhumed the skeletal remains of eight of at least 33 young men Gacy stabbed or strangled in the 1970s. (AP Photo/File)

Chicago — After running away from his Minnesota home in 1976, 16-year-old Jimmy Haakenson called his mother, told her he was in Chicago, then disappeared forever.

More than 40 years later, a detective from Illinois arrived at the family’s home to tell Haakenson’s relatives that at some point after hanging up the phone, the teenager crossed paths with serial killer John Wayne Gacy. Haakenson’s body, it turns out, was among dozens found in a crawl space of Gacy’s Chicago-area home in 1978. But the remains were only recently identified thanks to DNA technology that wasn’t available then, the Cook County Sheriff’s Department announced on Wednesday.

Gacy was convicted of killing 33 young men and was executed in 1994. But the revelation about Haakenson is the latest turn in a yearslong effort to solve the remaining mystery surrounding Gacy’s case: Who were the eight victims authorities hadn’t been able to identify?

James “Jimmy” Byron Haakenson’s body is only the second person that authorities have identified since Sheriff Tom Dart in 2011 ordered the remains of the eight victims exhumed and asked families of young men who went missing in the 1970s to provide DNA samples. The first was William Bundy, a 19-year-old construction worker from Chicago.