Keith L. Lang, 33, of Crystal Lake.

A Crystal Lake man who was found guilty of selling fentanyl-laced heroin that caused the death of a 23-year-old McHenry man has been sentenced to ten years in prison.

Keith L. Lang, 33, of the 600 block of Savannah Lane in Crystal Lake, was found guilty of one count of drug-induced homicide, a Class X felony, during a jury trial last August.

McHenry County Judge Robert Wilbrandt sentenced Lang on Wednesday to 10 years in the Illinois Department of Corrections. He will also have to pay $695 in court costs and fines.

The McHenry County Sheriff’s Office responded on September 22, 2017, to the unincorporated McHenry home of a 23-year-old man.

The man’s mother found him unresponsive in his bedroom, according to evidence at trial.

The victim, identified as Scott T. Koivisto, was pronounced dead at the scene and an autopsy revealed the cause of death was a fentanyl-laced heroin overdose.

An investigation revealed that the Koivisto had obtained several bags of heroin from a friend named Elizabeth Long, prosecutors said.

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

Long admitted she had bought the heroin from Lang and shared it with the victim on the night of his death.

Lang must serve 75% of his sentence under Illinois truth-in-sentencing guidelines.