Incomprehensible letter to a murder victim (5)

I believe the answer is:

babel

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'incomprehensible letter to a murder victim' is the definition.
I can't judge whether this definition defines the answer.

'letter to a murder victim' is the wordplay.
'letter' becomes 'b' ().
'to a murder victim' becomes 'abel' (Biblical character).
'b'+'abel'='BABEL'

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(Other definitions for babel that I've seen before include "Biblical tower site" , "Noisy Tower in the Bible" , "Biblical city with a tower" , "Noisy confusion of voices" , "Confused talk" .)

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