Stories of police attacking and killing people are cropping up online, including one about a New Mexico cop who's been charged with killing a man pulled over in a traffic stop. CBS News reports that Officer Christopher Smelser is facing involuntary manslaughter after gripping the man, Antonio Valenzuela, in a neck hold until he died. Police say Valenzuela was pulled over Feb. 29 in Las Cruces, tried running away, was tased twice to no effect, and went for a knife in his pocket when Smelser put him in a neck restraint. Police said on Facebook they fired Smelser after seeing the autopsy report. Valenzuela, 40, had an open warrant for a parole violation at the time, per the Las Cruces Sun News. In other police stories: