A Chicago police officer has died after being diagnosed with COVID-19, marking what is believed to be the first first responder death in Illinois due to the virus, officials announced Thursday.

Fifty-year-old Marco Di Franco, a highly-decorated 21-year veteran of the force who worked in the narcotics division, contracted the virus last week and was hospitalized over the weekend.

"Unfortunately the severity of the virus became overwhelming and he passed away," Chicago Mayor Lori Lightfoot said.

Chicago Mayor Lori Lightfoot revealed a Chicago officer has died from coronavirus and urged the city to heed a stay-at-home order and help save lives.

It remained unclear if the officer had any underlying conditions that made him high-risk for the virus.

He is survived by his wife and two children, ages 7 and 10. His brother is a fellow member of the police department who also works in the same narcotics division, officials said.

Officer Marco Di Franco, a first generation Italian American was assigned to an undercover narcotics team. His first love was his family, his second was being a Chicago cop and lastly his heritage and collection of Italian sports cars. He was one hell of a policeman. pic.twitter.com/cus4vKYIUu — Anthony Guglielmi (@AJGuglielmi) April 2, 2020

The death marks a first in the department, which as of Wednesday reported more than 60 confirmed cases citywide. Gov. J.B. Pritzker and city officials said they believe it is the first death of a first responder in Illinonis.

"His sacrifice underscores the threats that are faced by public service employees that by their profession are not allowed to shelter in place at home," Interim Supt. Charlie Beck said Thursday.

Officials said Di Franco's death underscores the need for people to heed the state's stay-at-home order.

"This officer was an example of what our first responders, our essential workers are doing every day to serve our city and keep it running and keep us safe," Lightfoot said. "Please let's honor his life and his service by doing your part to stay home."

Anthony Guglielmi, a spokesman for the Chicago Police Department, said in a tweet that the virus "has hit the Chicago Police Department and a dedicated family of city public servants very hard."

Guglielmi said Tuesday that at least four officers had been hospitalized by the virus, one of which was in critical condition.

The department has seen a rise in sick calls over the last week, reporting nearly 7% of its workforce had called out late last week and over the weekend. On Monday, 800 officers were out sick, but it remained unclear how many of those officers were experiencing symptoms of the coronavirus.

Guglielmi said the department is currently maintaining proper staffing despite the sick calls but has a plan in place should more officers call out.

"We haven't gotten there yet but we have a six-layer plan," he said, noting that anyone showing symptoms of the virus is placed on automatic medical leave.

Other departments are feeling the strain as more coronavirus cases are reported across the state. At the Cook County Jail, 101 inmates were diagnosed with the virus within a week of the first reported case, and more than a dozen employees at the facility have also tested positive.

The chief of police in suburban Aurora also tested positive for the virus, and last week the Blue Island Police Department was briefly shut down after an employee tested positive for COVID-19. The department has since resumed service.

Statewide Wednesday, Illinois reported 141 deaths and nearly 7,000 confirmed cases.