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The death of 18-year-old Anna Kepner has been officially ruled a homicide.

A death certificate states the cause of death was "mechanical asphyxia by other person(s)."

Kepner died on November 6 while on a family vacation aboard the Carnival Horizon cruise ship.

(This version adds information about Kepner's grandparents' interview with ABC News.)

Anna Kepner’s death has been ruled a

The 18-year-old high school senior from Titusville died Nov. 6 while on a family vacation aboard the Carnival Horizon. issued Monday and given to ABC News by the Kepner family, the cause of death was "mechanical asphyxia."

It says the teenager "was mechanically asphyxiated by other person(s)."

A message left for the Miami-Dade medical examiner’s office after hours Monday by FLORIDA TOD

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