The younger brother of slain Florida cheerleader Anna Kepner unknowingly went to sleep just feet away from his dead sister — after the boy noticed she wasn’t in their cruise cabin but assumed she had gotten up to spend time with their parents, according to a chilling new report.

Kepner, 18, had been sharing the Carnival cruise ship cabin with her brother, 14, and her 16-year-old stepbrother — who is now a suspect in her death.

On Nov. 6, the night she died, Anna had left dinner early and gone back to her cabin after complaining of feeling unwell, a source told the Daily Mail.

Her two siblings headed back to the room later that evening, where her younger brother changed his clothes and left again to take pictures of the Carnival Horizon as it continued its six-day Caribbean voyage.

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