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Hero Dad Who Drowned Saving Stepdaughter At Jersey Shore Was Medic In National Guard
Mark Antwain Costin of Vineland lived and died a hero.
His final act of heroism came on Labor Day, while trying to save his 12-year-old future step-daughter from drowning at the beach in Strathmere.
Costin's fiancé, Melissa Metcalf, told 6abc they planned a last-minute trip to the beach in Cape May County on Labor Day, Sept. 4.
They brought Metcalf's three children, Logan, Riley and Reagan Gallagher, as well as one of her son's girlfriends. They also brought Costin's daughter, Jocelyn.
But while Mark was swimming with Jocelyn and Reagan, tragedy struck. His soon-to-be stepdaughter, Reag…
