who beheads otto hightower in fire and blood

In Fire & Blood, Otto Hightower is beheaded on Queen Rhaenyra’s orders when she takes King’s Landing. The book does not clearly say an individual named executioner delivers the blow; it just states that he was “the first traitor to be beheaded”.

What the book says

• Otto is captured after the Blacks retake King’s Landing.
• Rhaenyra orders his execution for treason.
• The text focuses on the punishment, not on naming the person who physically swings the blade.

Why people get confused

The show version makes it look like Rhaenyra herself kills him, but that is a later adaptation choice, not something explicitly confirmed by the book. In the novel, the emphasis is on the political revenge, not the exact hand that carries it out.

So the safest answer is: Rhaenyra orders Otto Hightower’s beheading; the book does not clearly identify who actually decapitates him.