I think he died due to a broken neck, which meant he was quartered whilst still alive
Over to you Andy...
He was sentenced for treason and was meant to be hung, drawn, and quartered.
While climbing to the hanging platform, however, he jumped from the ladder and broke his neck, dying instantly. This meant he managed to avoid the horrors of having his testicles cut off, his stomach opened and his guts spilled out before his eyes...
His body was subsequently quartered, and his remains were sent to "the four corners of the kingdom" as a warning to others.