KANSAS CITY, Mo. (AP) — The Chiefs and Super Bowl MVP Kenneth Walker have agreed to a three-year deal worth up to $45 million to bring the former Seattle running back to Kansas City, a person familiar with the negotiations told The Associated Press on Monday. The deal includes $28.7 million guaranteed and $43.05 million in base value, said the person, who spoke on condition of anonymity because contracts cannot become official until the new league year begins Wednesday. Walker fills perhaps the