That’s cool
But again this: ‘who have died’ vs ‘who died’
Same diff as between "who have eaten" and "who ate" - or as between "who have attempted" and "who attempted."
You choose one over the other depending upon the given context and the given intention.
E.g., in certain cases / contexts, it might even be "more appropriate" to write "who had died." (Plusquamperfect)
That's the best I can say without resorting to all kinds of grammatical terminology which might only further confuse you.
Regards,