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An 18-year-old high school senior, Anna Marie Kepner, was found dead aboard a Carnival cruise ship.

The FBI is investigating the death, and court documents identify her 16-year-old stepbrother as a suspect.

Kepner's grandparents stated the blended family was very close and the teenagers shared a stateroom.

The grandparents of Titusville teenager Anna Marie Kepner opened up about the 18-year-old's death and the subsequent FBI investigation in an interview with ABC news that aired Monday, Nov. 24.

Anna Marie Kepner, an 18-year-old high school senior, was found dead aboard the Carnival Horizon cruise ship Nov. 7. She had been cruising with her father, stepmother and stepsiblings aboard the ship, which departed from Miami.

The FBI began an investigation into Ke

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