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A woman has died a day after the U.S. Coast Guard rescued her and two family members stranded on a remote Massachusetts island that they swam to when their boat went up in flames while anchored in a cove overnight Monday.

Cynthia Sullivan, 73, died Thursday, according to a Facebook post shared Friday by a family member, and after succumbing to injuries she suffered in the incident, Boston 25 News reported .

The family’s dog, who alerted Cynthia Sullivan and her husband Patrick, 72, and their 37-year-old son, Tyler, to the fire as they slept aboard their 30-foot powerboat The Third Wave, also died in the blaze.

The Sullivans swam to Naushon Island — a small island roughly four miles from Martha’s Vineyard — after they aw

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