CHARLOTTE, N.C. — Authorities believe a suspect in a pair of armed robberies was armed with a knife when a police officer shot and killed him in the parking lot of a North Carolina shopping center. Lt. Brad Koch of the Charlotte-Mecklenburg Police Department said Thursday that investigators believe 32-year-old Michael Daniel Kelley brandished a knife before Officer Timothy Kiefer fatally shot him Wednesday. A department statement says Kiefer shot Kelley after the suspect ran toward him and ignored the officer’s commands.