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)

An Illinois sheriff’s office said Wednesday that it has identified a Minnesota runaway as one of the victims of serial killer John Wayne Gacy.

Cook County Sheriff Tom Dart said in a news release that the remains of a person whose body was found under the crawl space of Gacy’s Chicago area home in 1978 were those of 16-year-old James “Jimmie” Byron Haakenson. The teenager had left his home in 1976 and was last heard from in August of that year when he called his mother and told her he was in Chicago.

Gacy was convicted of killing 33 young men and was executed in 1994. Haakenson was one of eight of Gacy’s victims who were buried without being identified. Dart’s office exhumed the remains of all eight in 2011 in an effort to identify them using DNA testing.

At the time, Dart asked that relatives of young men who vanished between 1970 and Gacy’s 1978 arrest submit saliva samples so that their DNA could be compared with the DNA of the remains. He said he hoped advances in scientific technology would allow investigators to figure out who the eight victims were.

Two siblings of the teen were among the scores of relatives who submitted saliva samples.