In this April 24, 2015, attorney Jonathan Melrod holds up a photo of Amilcar Perez-Lopez at a new conference in San Francisco, to announce a federal lawsuit. Prosecutors said two San Francisco police detectives will not face criminal charges for shooting and killing the young Guatemalan immigrant armed with a knife. The San Francisco district attorney said Wednesday, April 12, 2017, that the plainclothes detectives feared that Perez-Lopez was attacking one of them with a knife. The two were in an unmarked car when they responded to a call the night of Feb. 25, 2015 reporting a man chasing another man with a knife. (Paul Chinn /San Francisco Chronicle via AP)
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