Cops have hinted there is only one person of interest in the shocking Caribbean cruise murder of Florida cheerleader Anna Kepner.

Her stepbrother.

The boy was reportedly obsessed with the pretty 18-year-old who had dreamed of a career in the U.S. Navy.

The Titusville high school senior died on Nov. 7 while at sea, triggering widespread speculation as law enforcement scrambled to find answers. An autopsy later revealed that Kepner had been murdered and died from asphyxiation.

Two bruises were also discovered on her neck.

Anna and her family had embarked on a fun-filled six-day cruise on the Carnival Horizon. She had been sharing a cabin with her 16-year-old stepbrother and a younger sibling when tragedy struck. Her body was found hidden underneath her bed.

At first, the family circle

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