Police are investigating a fatal crash Monday morning.
A 54-year-old man was northbound on Interstate 45 near Interstate 610 at 7:50 a.m. when he had a medical episode, police said.
According to police, the man was driving a gray Hyundai Sonata and was unable to keep his car in his lane. The car struck a gray van.
The Hyundai hit the center wall and started moving south before striking a yellow Dodge van, which had stopped after the initial crash. That van then struck another vehicle.
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There were no other injuries.