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The death of 18-year-old Anna Kepner aboard a Carnival cruise ship has been ruled a homicide by mechanical asphyxiation.

Anna's father, Christopher Kepner, was subpoenaed to appear in court for his wife's separate child custody case.

Court documents indicate Anna's stepmother previously stated her own son, Anna's 16-year-old stepbrother, could be a suspect.

Anna Kepner's father Christopher Kepner was subpoenaed Nov. 25 as part of his wife's custody case with her former husband, according to .

Anna Kepner's father was on the cruise with her at the time of her death along with her stepmother, stepsiblings, biological siblings and grandparents.

He will now be required to appear in court on Dec. 5. No reason was given for the subpoena.

The filing comes days after the

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