On the eve of the trial of the first Baltimore cop charged in the death of Freddie Gray last year, a Chicago police officer is charged with murder for shooting a 17-year-old, Laquan McDonald, armed with a knife 16 times. That shooting was in 2014; the murder charge was filed hours before the release of a dash cam video that shows the disturbing shooting. The Chicago indictment of Jason Van Dyke joins a growing list of news stories about police-involved shootings or deaths in custody making headlines for the past two years. The list includes the deaths of Michael Brown in Ferguson, MO, Eric Garner in Staten Island, NY, Sandra Bland in Texas, Tamir Rice in Cleveland, and Walter Scott in North Charleston, SC. When jury selection begins next Monday, the defense team for Baltimore officer William Porter has the…