Multiplayer: Determining Which Player

Hello. I made the blueprint multiplayer system which Unreal Engine official YouTube channel showed and it works fine.

I have a multiplayer project and I am preparing some stuff, sketchs, ideas etc and someting is really bothering me.By the way, I am not a pro developer. I wonder how to determine which player is dead or stuff like that. Let’s say I have a 3-4 people multiplayer deathmatch game and the winner should be the last man standing. How can I determine that player? Am I be able to look players indexes’ or something I don’t know. If it was 1v1 then I’d be able to select whether it is server or client but I am stuck for multiple players.

It’d be appreciated if you can give some idead about this. Thank you.