A Baltimore police officer shot and killed a man who was wielding a knife in West Baltimore on Sunday, according to Baltimore Police Department Commissioner Michael Harrison. That man, Tyree Moorehead, was the creator of the city's "no shoot zones." As an activist, he spray-painted that message across the face of Baltimore—from block to block and from neighborhood to neighborhood. His father, Carlton Moorehead, confirmed to WJZ that his son had been killed by an officer while in the neighborhood of Sandtown-Winchester. Moorehead had been holding the knife while assaulting a female on the ground near the intersection of North...