The 1e
Tomb of Horrors had pre-gen characters.
That said, "expected rate of fatality"? It's not a killer dungeon. It doesn't aim to humble the players, just to make them think. It has a couple of brutal episodes, but it's nothing on
Isle of the Ape. Compare introductions (they're both written by Gary):
"As clever players will gather from a reading of the Legend of the Tomb, this dungeon has more tricks and traps than it has monsters to fight. THIS IS A THINKING PERSON'S MODULE, AND IF YOUR GROUP IS A HACK AND SLAY GATHERING, THEY WILL BE UNHAPPY! In the latter case, it is better to skip the whole thing." (ToH intro)