Machiavelli said:They could do something insanely high like 10d6 damage, roll 50+ damage, and force a massive damage save. They could be poisoned with something extremely expensive that has a death effect (again, only with a failed Fort save). I can't, however, recall any game effects that force instant death with no save. Especially not CR 2-ish ones
Power Word: Kill is an instant death with no save spell. {I hate all of the power word spells and anything that has a character die with no save.}
But still it is no where near a CR 2 spell.
