A great part of death messages will never be shown, even if they should be shown. Instead them pops out messages like "Player was doomed to fall".

Examples:
1) Shows "Player was doomed to fall by Skeleton" instead "Player was shot from high place by Skeleton"
2) Shows "Player was slain by Zombie" instead "Player was fireballed from high place by Ghast and got finished off by Zombie"
3) Shows "Player fell from high place" instead "Player fell off a ladder"

There is a list of never used messages from en_US.lang :
_ fell off a ladder
_ fell off some vines
_ fell out of the water
_ fell too far and was finished by _
_ was pummeled by _
_ was killed by _ using _

And messages, deleted from this file, but existed in snapshots of 1.5:
_ was <knocked/blown/shot/fireballed> from high place by _
_ <was ...> and got finished off by _
They were much better then "was doomed to fall" :/