RedactedNarrative: Vessel was anchored from both the bow and the stern.  Stern was facing into the waves.  Vessel began to take on water over the stern and bilge pumps were unable to keep up.  Operator cut stern anchor line as a result and vessel rolled to starboard capsizing.  Both individuals onboard were thrown into the water and neither was wearing a PFD.  One individual was able to hold onto the overturned vessel until rescue arrived.  The other suffered a heart attack while in the water.