FBI agents are zeroing in on the stepbrother of Florida cheerleader Anna Kepner, who mysteriously died on a Caribbean-bound cruise ship.

So far, authorities have not said how the 18-year-old died or whether she was murdered.

However, according to court documents obtained by the Daily Mail , the FBI is calling her 16-year-old stepbrother a “suspect” amid disturbing allegations about the tragic young woman’s blended family.

Hovering in the background has been a bitter battle between Kepner’s stepmother, Shauntel Hudson, and her ex-husband. The warring twosome have both filed legal briefs attempting to control custody of the two minor children they share.

Hudson accused her ex-husband of domestic and physical abuse against their two youngest children.

Interestingly, one of the children

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