Decapitation

Decapitation, or beheading, was the act of removing an individual's head. It was a common method of public execution, (PROSE: The Roundheads) which the Doctor himself had been threatened with, on occasion. (TV: The Shakespeare Code, The Masque of Mandragora)

Members of the Order of the Headless were decapitated in their initiation. Their heads remained mobile, even after rotting into skulls. (TV: A Good Man Goes to War, TV: The Wedding of River Song)

Time Lords could still regenerate after being decapitated. Cavisadoratrelundar was decapitated and only killed after being stabbed in both her hearts. (PROSE: The Shadows of Avalon)

In 1492, one of the factions angling to succeed to the duchy of San Martino, sanctioned the beheading of the Fourth Doctor. (TV: The Masque of Mandragora)

In 1599, following a performance of William Shakespeare's Love's Labour's Won, Queen Elizabeth I called for the Tenth Doctor's head, but the Doctor escaped in his TARDIS. (TV: The Shakespeare Code)

After the Roundheads emerged victorious from the English Civil War, they beheaded King Charles I in 1649. (PROSE: The Roundheads)

In 1747, the final beheading at Tower Hill in London took place. (PROSE: The Dying Days)

In 2006, Blon Fel-Fotch Passameer-Day Slitheen killed Mr Cleaver by decapitating him. While disguised as a human, she claimed that he slipped on "a very icy patch". (TV: Boom Town)

In 2011, a suicide bomber that was still living (due to Miracle Day) even after blowing himself up was still conscious even after his head was detached. (TV: The New World)