A doctor cycling on an Orange County highway was mown down by a Lexus and then fatally stabbed by the driver, who was then restrained by bystanders.The cyclist, later identified as Michael Mammone, 58, was struck from behind by a white Lexus on the Pacific Coast Highway in the Dana Point area on Wednesday.After the crash, the Lexus driver exited his car and stabbed the cyclist in the back in front of horrified bystanders, leaving him lying on the highway with severe injuries.
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