Keith L. Lang, 32, of Crystal Lake.

A jury found a Crystal Lake man guilty of drug-induced homicide in the fentanyl-laced heroin overdose death of a 23-year-old McHenry man in 2017.

Keith L. Lang, 32, of Crystal Lake, was found guilty of one count of drug-induced homicide by a jury on Wednesday.

The McHenry County Sheriff’s Office responded to the McHenry home of 23-year-old Scott T. Koivisto on September 22, 2017.

Koivisto was found dead in his room by his mother following an overdose of fentanyl and heroin, prosecutors said.

An investigation revealed that Koivisto had obtained several bags of heroin from a friend, identified as Elizabeth Long.

The sheriff’s office obtained a search warrant for Elizabeth Long’s phone, which revealed that she had arranged to purchase heroin from Keith Lang.

Elizabeth Long admitted she had bought the heroin from Keith Lang and shared it with Koivisto on the night of his death, prosecutors said.

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Elizabeth Long was sentenced in November 2018 to prison on a possession with intent to deliver heroin charge. She was released in March.

Keith Lang will be sentenced on September 24 and he faces 6-30 years in the Illinois Department of Corrections. He will be required to serve 75% of his sentence.

The case was investigated by the McHenry County Sheriff’s Office and prosecuted by Assistant State’s Attorney Michael Combs and Rod Drobinski.