A DuPage County sheriff's deputy shot and killed a teenager while responding to a domestic violence call near Villa Park early Monday morning, officials said.
Deputies were called about midnight to a home in the area of Standish Lane and Ardmore Avenue for a report of domestic violence in progress, county officials said.
The first responding officer was involved in an altercation with the teen, which led to the shooting, police said.
The boy has been identified by sources close to the investigation as 17-year-old Trevon Johnson, who was black and believed to be mentally handicapped.
The officer, who is white, told investigators that he believed the teen had a knife. He was the only officer on the scene when he fired multiple shots at Johnson, sources say.
Johnson was taken to Elmhurst Hospital, where he was later pronounced dead.
It's the first fatal shooting by a DuPage County deputy in more than 20 years, sources say.
DuPage County public information officer Sgt. Robert Harris declined to confirm any details about Johnson or any further information about the officer and his tenure with the department.
"The Illinois State Police is handling this investigation, so at this time, I'm unable to comment further," he said via email Monday night. "Until we receive investigative information from them we can't comment further. I'm hoping that by early afternoon tomorrow that changes and we can provide additional details."
An investigation by an outside agency in a police-involved shooting is standard, Illinois State Police Master Sgt. Jason Bradley said.
"State police conducting an independent investigation into the shooting doesn't mean the officer did anything wrong," he said. "That's just standard protocol to have a third-party agency do an investigation, as well."
Bradley declined to give any further details.