The girlfriend of one of the suspects in last December's local bus stop shooting has pleaded guilty to charges in an unrelated case. Twenty-year-old Erica Adams entered the plea to counts of robbery and violating the controlled substance act. In exchange, police dropped charges of accessory against her in the bus stop case. She was accused of helping the accused bus stop shooters avoid arrest. Adams is the girlfriend of 18-year-old Dresden Williams. He and two others face attempted murder charges for the shooting on Walnut and Alexander that wounded six young people as they got off the school bus.