Well, to the best of my knowledge there is no graphic decapitation or resultant corpse anywhere in the game.
At best there may perhaps be a headless charred corpse?
In-game username: Un1korn | Happy member of the PCNA UESP guild (Resident Daggerfall Covenant enjoyer) | Main & basically only character: Crucian Vulpin, Imperial Dragonknight of the Daggerfall Covenant, and Undaunted Bulwark (I tank) | Mountain bike enjoyer and vulpine appreciator | If you know me from PCEU: No