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Mary Angela Bock

Diamond Reynolds, the girlfriend of Philando Castile, weeps during a press conference at the Governor'sResidence in St. Paul, Minn., Thursday, July 7, 2016. Philando Castile was shot in a car Wednesday night by police in the St. Paul suburb of Falcon Heights. Police have said the incident began when an officer initiated a traffic stop in suburban Falcon Heights but have not further explained what led to the shooting. (Leila Navidi/Star Tribune via AP)

Video’s role in tragedy: How snapping photos or shooting videos helps police and the public alike

Mary Angela Bock