Kinda like what happened to Edward II.
Isabella and Mortimer feared that Edward might yet make a resurgence, and so Mortimer arranged for Edward's death. He did not want it to appear that violence had been committed against the king. He was hoping it might appear as a natural death, or suicide. However, attempts to starve the king did not work, and in the end Edward was held down while a red hot poker was inserted into his bowels.