Coroner Releases Causes Of Death For Coworkers Found Dead In Parked Car In Crystal Lake

CRYSTAL LAKE, IL — Carbon monoxide poisoning caused the deaths of two coworkers found dead in a car on Coventry Lane earlier this month in Crystal Lake, authorities said Wednesday.

Yeisemar Morales-Sanchez, 20, of Crystal Lake, and Kirby Graham, 31, of Grayslake, were found dead by emergency responders in the vehicle in the 700 block of Coventry Lane at about 5:30 a.m. on Nov. 4, according to authorities.

A defective exhaust system of the vehicle, which Graham was driving prior to the incident, led to both suffering from carbon monoxide toxicity, according to a news release from the McHenry County Coroner's Office.

Emergency crews responded and attempted life-saving measures, but both Graham and Morales-Sanchez were pronounced dead at the scene, according to police.

Morales-Sanchez and Graham were coworkers, coroner's office officials told Patch.

The deaths have been ruled to be accidental.

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This is a developing story. Check back for updates.