Casey was in serious condition Friday morning.
The truck, driven by Ryan Mullins of Springfield, had slowed for a postal service vehicle that was in front of him. Mullins was driving home from work, he said. It was then he saw the motorcyle in his side mirror as it slid into the left rear of his truck.
Mullins said Casey was not wearing a helmet.
Casey should expect to receive a citation for failure to maintain assured clear distance, Ohio Highway Patrol Trooper William Ward said. No charges were expected against Mullins.
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