The motorcyclist collided with a Honda SUV just before 5 p.m. Tuesday at Route 206 and Jacksonville-Jobstown Road in Springfield.
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Police say the 24-year-old motorcyclist was killed and a 70-year-old woman driving the Honda was treated for minor injuries.
The Attorney General's Office says, prior to the crash, the motorcyclist was being followed by an off-duty member of the state police in an unmarked state police vehicle.
Both were traveling at speeds of more than 100 miles per hour.
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At some point during the pursuit, a Springfield police officer was following behind the unmarked state police vehicle.
Investigators have not said how the pursuit started.
The name of the motorcyclist has not been released.