Any person pulled from cold water should be treated, by medical professionals, for hypothermia. Once shivering stops, core body temperature begins to drop critically. Your goal in treating hypothermia is to prevent further body cooling.
Severe cases call for rewarming by trained medical personnel.
In all cases, arrange to have the victim transported to a medical facility immediately. Check breathing and heartbeat. In cases of hypothermia you should monitor victim very closely. Start CPR if necessary. Remove victim's clothing with a minimum of movement, cut them away if necessary.