SACRAMENTO, Calif. — Police on Wednesday afternoon were questioning a “person of interest” as part of the investigation into three recent stabbings in Davis that killed two men and seriously wounded a woman. Officers detained the person who was spotted near Colby Drive and Pine Lane, about a block west of Sycamore Park where a University of California, Davis student was stabbed to death Saturday night as he was walking home. Lt. Dan Beckwith, a spokesman for the Davis Police Department, said the “person of interest” was not detained and voluntarily went with officers to police headquarters for...