Tuna Salad Casserole

2 cans tuna, drained - flaked 
1 can cream of celery soup 
4 hard-cooked eggs, chopped 
1 cup diced celery 
1/2 cup mayonnaise 
1/4 tsp. pepper 
1 1/2 cups crushed potato chips 

Combine all ingredients except 1/4 cup of the crushed potato chips; stir well. 
Pour into greased Crock Pot. 
Top with remaining potato chips. 
Cover and cook on Low setting for 6-8 hours.