The feds are keeping it zipped in the shocking cruise ship death of a Florida cheerleader.

High school senior Anna Kepner, 18, was discovered dead over the weekend on a Carnival cruise liner, and law enforcement has remained tight-lipped on the cause.

One red flag is that the FBI is now investigating. Deaths aboard cruise ships are typically investigated by local police — unless the incidents are deemed suspicious.

The feds wouldn’t say what led to the investigation, nor would they comment on whether foul play is suspected. The ship docked on Saturday in Miami. It was not clear who she was travelling with on the cruise.

Kepner, from Titusville, on the Space Coast, was slated to graduate from high school next May and then planned to join the military.

“When she walked into a room, she

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