Hook player death and call play_it function from there.
Also the code I pasted plays sound to everyone with same volume, but there is also a way to play sound somewhere in map, so if player dies in some place, other players will hear the sound coming from that place (if they are close enough).
You need to use emit_sound() function for that.
http://www.amxmodx.org/funcwiki.php?go=func&id=282
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