In a large bowl, combine the tomatoes, beans, rice, 1-1/2 cups cheese, corn, onion, Worcestershire sauce, chili powder, pepper and salt. Remove and discard tops and seeds of green peppers. Fill each pepper with about 1 cup vegetable mixture. Place in a 5-qt. slow cooker. Cover and cook on low for 8 hours., Sprinkle with remaining cheese. Cover and cook 15 minutes longer or until peppers are tender and cheese is melted.