TITUSVILLE, Fla.(AP) — The 16-year-old stepbrother of the Florida high school senior who died this month on a Carnival cruise ship has been identified as a suspect in her death, according to court documents filed by his parents.

The disclosures — contained in motions filed in an ongoing custody dispute — offer the clearest public indication that federal investigators are scrutinizing a member of the victim’s own blended family.

The documents show both parents acknowledging that their middle child — identified in court only by his initials “T.H.” — is under FBI investigation in connection with the death of Anna Kepner, a high school cheerleader from Florida’s Space Coast.

Her death aboard the ship has drawn international attention and remains shrouded in uncertainty. Neither the FBI

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