How to add a check to this script? Please help!

So I am trying to make a mini game game, however I have no clue on how to add a check to see if all players have died, can someone help me?

So here is the script.

wait(2)
local select = script.Rounds:GetChildren()
local h = script:WaitForChild("Status")
function start()
	if game.Players.NumPlayers >= 1 then
		wait(3)
		wait(1)
		h.Value = "Choosing gamemode!"
		local roundchosen = math.random(1, #select)
		wait(.1)
		local round = select[roundchosen]
		print("Chosen round: " .. round.Name)
		wait(3)
		if round.Name == "FFA" then
			FFA()
		elseif round.Name == "DODGEMS" then
			DODGEMS()
		elseif round.Name == "SFFA" then
			h.Value = "Gamemode chosen: " .. round.Name
			wait(3)
			SFFA()
		end
	else
		h.Value = "Waiting for 2 players too start!"
		wait(1)
		start()
	end 
	end
	
	function SFFA()
		local maps = game.Lighting.Maps.FFA:GetChildren()
		h.Value = "Choosing map.."
		wait(3)
		print("Map selection")
		local mapchosen = math.random(1, #maps)
		local map = maps[mapchosen]
		print(map.Name)
		wait(4)
		local mapclone = map:Clone()
		mapclone.Parent = game.Workspace
		mapclone:MakeJoints()
		wait(4)
		for _, player in pairs(game.Players:GetPlayers()) do
			local contestants = {}
			table.insert(contestants, player)
			local spawnmodel = map.Spawns:GetChildren()
			local spawn = math.random(1, #spawnmodel)
			local spawnchosen = spawnmodel[spawn]
			player.Character.Torso.CFrame = CFrame.new(spawnchosen.Position + Vector3.new(0, 3, 0))
			spawnchosen:Destroy()
		end
		for i = 60, 1, -1 do
			h.Value = "Time left: " .. i -- The check would go here.
			wait(1)
		end
		start()
	end