Asleep on their boat anchored off Cape Cod, the Sullivan family was awaken to their dogs barking, the sound of fireworks and smoke. Their boat was on fire.

Tyler Sullivan and his parents jumped from the boat Monday night and, in the darkness, began swimming to a privately-owned island. Tyler and his father, Patrick Sullivan, survived, but Cynthia “Cici” Sullivan was badly injured during the ordeal and died Thursday at a hospital, a spokesperson for the Cape & Islands district attorney’s office said. She was 73.

Patrick Sullivan, who was also injured in the fire, is awake and breathing without help, his family posted on Facebook.

Once the Sullivans reached the tiny island, they hunkered down in a barn and waited for help. They had left Falmouth on Friday and planned to return Tuesday aft

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