In the early morning hours of a June day in East Williamsburg, Brooklyn, Sean Robinson, 33, was shot and killed while sitting in the passenger seat of his Ford Mustang on Morgan Avenue after leaving a party. An assailant approached the car with a 9-millimeter handgun, demanded possessions and fired a single shot that struck Robinson in the chest. The bullet tore through his rib cage and right lung and penetrated his heart. Robinson, an Army Reserve veteran and father, was taken to a nearby hospital by the driver but was pronounced dead on arrival; he left behind children and a fiancée.

The attacker then removed two gold chains from Robinson’s neck, assaulted Robinson’s 38-year-old friend who had been standing outside the vehicle, pistol-whipping him and stealing another chain. The NYPD arrested 29-year-old Ramel Chapman in July and charged him with murder, robbery and criminal possession of a weapon. What additional details about that night or Chapman’s movements might help explain how this robbery escalated to such lethal violence?