Combine all the ingredients in the slow cooker except for the shrimp.
1 lb. boneless, 1 lb. andouille sausage, 28 oz. can diced tomatoes, 1 onion, 1 green pepper, 1 cup celery, 1 cup chicken broth, 2 tsp. fresh oregano, 2 tsp. fresh parsley, 2 tsp. homemade Cajun seasoning, 1 tsp. cayenne pepper, ½ tsp. fresh thyme, Sea salt and freshly ground black pepper