The death of Anna Kepner, an 18-year-old woman found dead on a Carnival cruise ship earlier this month, has been formally ruled a homicide, according to a report.

Her death certificate, which was issued Monday and obtained by ABC News , says Kepner’s death was caused by “mechanical asphyxia.”

The certificate added she was “mechanically asphyxiated by other person(s).” The date of injury was listed as Nov. 6, while she travelling abroad on the Carnival Horizon with her family.

The formal autopsy and toxicology reports have not been released yet.

The news comes a week after Kepner’s stepbrother was named as a possible suspect in her death, as stated in a legal document in a separate case.

Kepner, a recent high school graduate, was travelling with her family on the cruise ship

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