Anna Kepner’s heartbroken father wants his stepson punished if federal agents find he killed the 18-year-old Florida cheerleader on a Carnival cruise ship — but refused to say whether he believes the boy had any role in his daughter’s mysterious death.

“I do not stand behind what my stepson has done,” Christopher Kepner, 41, told People.

“I want him to face the consequences … I will be fighting to make sure that does happen.”

The high school senior had been traveling on the Carnival Horizon ship with her blended family — including her father, stepmother, siblings, stepsiblings and grandparents — when she was found dead on Nov. 7.

Her lifeless body was stashed under her cabin bed and wrapped in a blanket covered by life vests.

The FBI has offered no updates on its investigation, but

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