Brian K. Mulcahy, 57, of Lake Barrington.

A Lake Barrington man has been sentenced to 20 years in prison for giving his 15-year-old grandson fentanyl-laced heroin that led to the boy’s death in LaSalle County.

Brian K. Mulcahy, 57, of Lake Barrington, was arrested by the U.S. Marshals Fugitive Task Force in August 2021.

Mulcahy had been wanted on an arrest warrant for drug-induced homicide, a Class X felony, according to Marseilles Police Chief Brian Faber.

The charges stemmed from the death of a teenager on April 14, 2021, in Marseilles, a town in LaSalle County.

Officers and paramedics responded to a home in the 200 block of East Bluff Street around 5:54 p.m. that day for a report of an unresponsive person, Faber said.

Emergency personnel found a 15-year-old boy who was unresponsive. It was determined he was deceased before first responders arrived, Faber said.

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The coroner’s office conducted an autopsy on the victim and found he died as a result of a lethal dose of heroin and fentanyl.

1430 WCMY reported that the victim was Mulcahy’s grandson and Mulcahy was supposed to be caring for children in the home on the day of the boy’s death.

LaSalle County State’s Attorney Joe Navarro said in an interview with the radio station that Mulcahy provided fentanyl-laced heroin to the victim, causing his death.

“It’s just a sad, sad situation,” Navarro said.

Mulcahy pleaded guilty to the charge Friday morning as part of a plea agreement and was sentenced to 20 years in prison.

He remains held in the LaSalle County Jail awaiting transport to a state prison, jail records show.