The police chief who oversaw Seth Rich’s unsolved murder case has socialized and been honored alongside key Hillary Clinton advisers and even Rich’s own boss at the Democratic National Committee. Rich is widely reported to be the source of Wikileaks’ damning 2016 email release that showed the DNC colluding to hand the nomination to Clinton at the expense of Bernie Sanders. He was gunned down in D.C. 12 days before Wikileaks’ release. Former Metropolitan Police Department chief Cathy Lanier resigned from her post the month after Rich’s murder to accept a position running security for the National Football League. She...