RedactedNarrative: Victim was with son in boat when they experienced mechanical issues with their boat.  Four male subjects from Illinois offered to tow victim and his son to marina for repair.  While towing victims boat, victim fell into the water from an elevated seat located near the stern of the boat.  Victim was not wearing a PFD and did not know how to swim.  Victims son has various medical issues to include terminal cancer and therefore could not assist victim.  Two male subjects from boat B entered the water and were able to get victim into their boat and provide CPR.