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I'm Cold... So Cold... covers cases where mundane death feels cold, I'd say, so you could call that the supertrope if you needed one. Ghostly Chill if it's more supernatural but you want to avoid the idea that the character is evil or one of the undead — they're close to death, which I think could count. Chill of Undeath, and Evil Is Deathly Cold already seem to overlap substantially in many cases.
We have no "Death is Cold" trope, right? Just subtropes?
Trying to find the trope for a statement of "cold as death" from Fanfic.Dungeon Keeper Ami, but since the god of undeath is implied a little later, Chill of Undeath might be more accurate...
Note to Self: Examples: