I agree with the above, as funny as you might think it could be,
Just substitute your macro with something like above.
While the death may or may not be your fault, and its 'just a macro',
having to hear that if it occurs multiple times does not give a good feeling to you or your party.
most people fail to realize that their definition of 'funny' is at the uncomfortable expense of others,
If i were a DD and a healers raised with "Sorry you died under my watch. I'll try not to let it happen again." in a 24 man raid multiple times,
Id find that funny.
But i dont think the healer themselves would feel much happy with that scrolling mutiple times.