This file booking photo provided by the Stillwater Police Department shows Adacia Chambers, who is accused of running a red light and purposely driving around a barricade and over a police motorcycle before crashing into spectators at Oklahoma State University's homecoming parade. Payne County District Attorney Laura Thomas formally charged Chambers with four counts of second-degree murder and 46 counts of felony assault on Wednesday, Nov. 4, 2015. (Stillwater Police Department via AP, File)
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