A minor may face criminal charges tied to a mysterious death aboard the Carnival Horizon earlier this month, according to a new family court filing cited by ABC News.

The document, filed Monday in an unrelated custody case, says federal investigators are examining the sudden death of 18-year-old cheerleader Anna Kepner and have warned that one of her step-siblings could be implicated.

Kepner, of Titusville, Florida, was found dead on November 8 during a Miami-to-Caribbean cruise. The ship returned to Miami the same day. The Miami-Dade medical examiner has not released a cause or manner of death. According to the filing, the FBI is conducting an investigation “arising out of the sudden death of 18 year old Anna Kepner.”

The filing came from Shauntel Hudson, Kepner’s stepmother, who was

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