The white Chicago police officer was charged with first-degree murder in the black 17-year-old's October 2014 shooting death.
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Police dashcam video shows Van Dyke shooting McDonald 16 times. Van Dyke was charged in November 2015, shortly before the video was released to the public.
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Van Dyke's attorneys said McDonald's juvenile records, from his time as a state ward, are necessary to prepare their client's defense. Van Dyke claims he shot McDonald in self-defense.