CHICAGO (CBS) — A man was found dead inside a car Tuesday morning in the River North neighborhood, according to Chicago Police.

Just after 11 a.m., the 18-year-old was found unresponsive by building security in a parking garage in the 500 block of North Kingsbury, police said.

He was pronounced dead at the scene, police said. There were no signs of trauma.

A police source said the death appears to be a suicide.

Area Central detectives are investigating.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2016. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)