The Beltway Snipers: The Invisible Killers — Ep. 1 | MK Confidential

This week, “MK Confidential” opens on a warm weekday evening in Wheaton, Maryland, an inner suburb just north of D.C. On October 2, 2002, a low, flat, pop sound breaks the evening buzz of errands outside a grocery store. Those nearby think of it as a blown-out tire or a falling pallet of goods. One man drops to the asphalt. James Martin, a fifty-five-year-ol…