A vehicle was driving very fast just before 4 a.m. in the 4300-block of Touhy Avenue before it hit a tree on the south side of Touhy, Lincolnwood police said.
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The driver and sole occupant of the vehicle was pronounced dead on the scene, police said.
The person who died had not yet been publicly identified later Monday morning.
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Lincolnwood police and the Major Crash Assistance Team are investigating the incident.
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Touhy Avenue reopened about 11:30 a.m. after the investigation.
Drivers were asked to find alternate routes.