DIES
I guess for this you could take the sound of the narns that get blown up when brining G'Kar out of the Za'ha'dum system, or rather some part of it.
The full quote, if memory serves me right goes like this:
"In death we salute you, honour our names. Good bye." *explosion* *shadow fighter screeming and exploding*

Since it is a bit long for dieing, maybe just the "in death we salure you" part. Maybe move it over to static in sentence. "In death we sa zzzzzzz".
And in the episode were the Narn and Cantauri freighters fight outside the station ("And now for a word"??) you can pick up some one word commands in Narn. Of course we don't know what they mean exactly, but they most likely are something like attack, fire or destroy them.