Burial. Assuming there's a corpse.
Unless I'm doing dungeon crawls, which I rarely do, the heroes of my campaigns cannot simply be replaced by another character. The story and the characters become so closely bound that the end of one pretty much means the end of the other.
However, I'm not above "resurrection," as long as it works within the storyline. For instance, the Aasimar character in my campaign was raised by his grandfather, a human. He had never known either of his parents, but he was aware that his mother was deceased. He had inherited a silver ring engraved with angelic wings. While he believed this ring belonged to his mother, it had actually been passed down from generation to generation as a connection, however tenuous, to the strain of celestial blood in his mother's side of the family.
When, during a battle with an ogre mage, the PC was slain...I made an on-the-spot decision to have the ring "resurrect" the character. The ring then crumbled into dust. The character had never suspected the ring was magical. It was actually just a signet ring at character creation. However, when dealing with a character bound in prophecy and with a certain destiny, this seemed a more appropriate step than having him wake up days later in a temple.
It should also be said that he's the only PC in the campaign. Obviously, if there were other players I would have taken a different approach, but when you only have one player you are limited in what you can and cannot do. As I've mentioned in previous posts, this character is not going to die a random death after a five year campaign. Although he may indeed need to die before he can accomplish his destiny.