A man involved in an early-morning crash on Interstate 55 south of Route 126 in Plainfield died of his injuries Wednesday, state police said.
Trooper DeAnn Falat said the man was driving a 2006 Mazda on southbound I-55 near milepost 260 when he lost control for unknown reasons and struck a center median wall. The Mazda became disabled in the left lane with no lights activated, police said.
When a Good Samaritan driving a 2002 Pontiac pulled over in front of the Mazda to check on the crash victim, a semi-trailer that was also traveling in the left lane struck both vehicles, police said.
The driver of the Mazda was airlifted to Advocate Good Samaritan Hospitalin Downers Grove, where he died of his injuries, police said.
State police did not immediately release the man's name.
Sgt. R. Caves said no one else was injured in the accident. An Illinois State Police investigation is still pending, police said.