Add tomatoes, tomato paste, chicken (cooked or raw), Sausage, broth, green pepper, onion, celery, Cajun seasoning, garlic, black pepper, and cayenne pepper to prepared slow cooker. Stir gently to combine all the ingredients.
Cook this portion on low for about 2 hours if your chicken is already cooked or 5 to 6 hours if you adding raw chicken.
Add shrimp and cook about another 10 minutes until the shrimp is warm.
You can serve this over cooked white rice or combine the rice in the crockpot just before serving.