Arrange chicken pieces in crock pot.
Mix lemonade, brown sugar, vinegar and ketchup together well.
Pour over chicken and cover.
Cook on high for 3-4 hours or on low for 6-8 hours.
Transfer liquid to saucepan and skim fat.
Leave Chicken in the crock pot keep it covered so it stays hot.
Combine cornstarch and cold water and add slowly to liquid, while stirring over low heat.
Serve when thickened.