Gerry Anderson, the creator of Thunderbirds and Space: 1999, has passed away peacefully in his sleep at the age of 83.
Dying peacefully in your sleep is the way to go, I think.
Do people ever die violently in their sleep? "There was blood everywhere! His fingernails and eyes popped out! He was snoring so hard he sucked his teeth out of his gums! And then he was gone... At least it was in his sleep. RIP, old friend."