Police conduct a death investigation after a man and a woman, who were co-workers, were found unresponsive in a parked car before being pronounced dead in the area of South Coventry Court and Coventry Lane in Crystal Lake Tuesday morning. | Photo: Tracy Mathesius

The coroner has released the identities of a 20-year-old Crystal Lake woman and a 32-year-old Grayslake man, who were both co-workers, found dead in a parked car in Crystal Lake.

The Crystal Lake Fire Rescue Department and Crystal Lake Police Department responded around 5:32 a.m. Tuesday to the 700 block of Coventry Lane for a medical call.

Crystal Lake Deputy Police Chief Richard Neumann said a 911 caller reported two people possibly asleep in a vehicle parked on the roadway.

Police conduct a death investigation after a man and a woman, who were co-workers, were found unresponsive in a parked car before being pronounced dead in the area of South Coventry Court and Coventry Lane in Crystal Lake Tuesday morning. | Photo: Tracy Mathesius

Police officers arrived and reported finding a male and a female in a vehicle. Both were unconscious and not breathing.

McHenry County Coroner Dr. Michael Rein identified them as Yeisimar Morales-Sanchez, 20, of Crystal Lake, and Kirby Graham, 32, of Grayslake.

Neumann said Morales-Sanchez and Graham showed “no obvious signs of injury.”

Police conduct a death investigation after a man and a woman, who were co-workers, were found unresponsive in a parked car before being pronounced dead in the area of South Coventry Court and Coventry Lane in Crystal Lake Tuesday morning. | Photo: Tracy Mathesius

Two ambulances and two fire engines were dispatched to the scene and officers began performing CPR on the victims.

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Paramedics arrived and confirmed Morales-Sanchez and Graham were still unresponsive as they took over lifesaving measures.

Lifesaving measures were unsuccessful and both were pronounced dead at the scene, Neumann said.

Police conduct a death investigation after a man and a woman, who were co-workers, were found unresponsive in a parked car before being pronounced dead in the area of South Coventry Court and Coventry Lane in Crystal Lake Tuesday morning. | Photo: Tracy Mathesius

A heavy police presence was reported at the scene throughout the morning on Tuesday.

Officers set up crime scene tape around the scene as they worked to investigate the incident.

The car involved was parked on South Coventry Court near Coventry Lane.

Police conduct a death investigation after a man and a woman, who were co-workers, were found unresponsive in a parked car before being pronounced dead in the area of South Coventry Court and Coventry Lane in Crystal Lake Tuesday morning. | Photo: Tracy Mathesius

Morales-Sanchez and Graham were both co-workers who worked at a manufacturing plant in McHenry, the coroner’s office said.

The coroner’s office said autopsies have been scheduled for Thursday on Morales-Sanchez and Graham.

Neumann said investigators are still gathering evidence but are “confident” there is no danger to the public as a result of the incident.

Police conduct a death investigation after a man and a woman, who were co-workers, were found unresponsive in a parked car before being pronounced dead in the area of South Coventry Court and Coventry Lane in Crystal Lake Tuesday morning. | Photo: Tracy Mathesius

The case remains under investigation and anyone with information is asked to contact the Crystal Lake Police Department at 815-356-3620.

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Anonymous tips can also be submitted to the Crystal Lake Police Department by texting the word CLPDTIP along with the tip information to 847411.