Who is he and what killed him? Those are the questions authorities are trying to answer in connection with the death of a man clad in black leather, found with a neck collar hooked on a wrought iron fence in Greenwich Village. Thursday, the city's medical examiner's office said an autopsy failed to determine how the man died. The body was discovered at 6:40 a.m. Wednesday by a woman walking her dog on Hudson Street, police said. He was dressed in black leather, including a mask, and his face was pressed against the fence, police said. A spiked dog collar...