The death of a Florida teenager on a Carnival cruise ship earlier this month has been ruled a homicide, the latest development in a case that has drawn international attention and sparked intense speculation on social media.

Anna Kepner's cause of death was “mechanical asphyxia," according to a copy of her death certificate obtained by ABC News, which said the 18-year-old “was mechanically asphyxiated by other person(s)."

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