Combine soup bones, pork, veal, beef, bay leaves, salt, pepper, and water in a large stock pot; bring to a boil. Reduce heat; cover and simmer 3 hours. Remove from heat, and cool to room temperature.
Remove soup bones from broth; remove meat from bones, discarding bones. Coarsely chop meat, and return to broth. Cover and refrigerate overnight.
Skim off and discard fat from surface of broth. Add potatoes, green pepper, onion, celery, corn, tomatoes, catsup, and Worcestershire sauce; bring to a boil. Reduce heat; cover and simmer 30 minutes. Add liver; cover and simmer an additional 30 minutes. Remove and discard bay leaves.
Ladle stew into individual serving bowls; serve hot.