GREENSBORO, N.C. (AP) — An off-duty police officer was shot and killed in North Carolina after witnessing a crime at a gas station and approaching the two suspects, officials said. The police sergeant, Philip Dale Nix, was a 23-year veteran of the Greensboro Police Department, according to a Sunday news release from the agency. Three men have been arrested in the case, including Jamere Justice Foster, 18, who is charged