Place the ham in a 6 quart (or larger) slow cooker.
In a small bowl combine the remaining ingredients and pour over the ham. Cover with lid and cook on LOW for 4-6 hours and HIGH for 2-4 hours or until ham reaches an internal temperature of 140 degrees F (60 degrees C).
Remove ham from slow cooker, cover loosely and allow to rest. Meanwhile, pour juices into a saucepan and bring to a simmer. Mix a small amount of cornstarch with water and pour in a thin stream into the boiling sauce while whisking to thicken. Brush over ham and serve sliced ham with glaze. (This is optional but really tasty!)