Help on finding if a player has died?

For this, I want it to check if one of the duelers have died.

But, I have no idea how to do this. Please help!

local gui = game.Workspace.Part1.v.z

function Fight()
    for i = 15, 0, -1 do
        gui.Text = "Intermission (0:"..i..")"
        if i <= 9 then
            gui.Text = "Intermission (0:0"..i..")"
        end
        wait(1)
    end
    gui.Text = "Now choosing dulers, (1 and 2)."
    wait(5)

    local plrs = game.Players:GetPlayers()
    local p1 = plrs [math.random(1, #plrs)]
    local p2 = plrs [math.random(1, #plrs)]

    repeat p2 = plrs [math.random(1, #plrs)] until p2 ~= p1

    gui.Text = p1.Name.. " and " ..p2.Name.. " have been chosen."
    wait(3)

    p1.Character:MoveTo(Vector3.new(147.5, 11.6, 15)) 
    p2.Character:MoveTo(Vector3.new(147.5, 11.6, -59))

    local sword1 = game.ServerStorage.Sword1:Clone()
    sword1.Parent = p1.Backpack

    local sword2 = game.ServerStorage.Sword2:Clone()
    sword2.Parent = p2.Backpack

    wait(2)

    for i = 30, 0, -1 do
        gui.Text = "Round, please wait (0:"..i..")"
        if i <= 9 then
            gui.Text = "Round, please wait (0:0"..i..")"
        end
        wait(1)
    end
    p1.Character:MoveTo(Vector3.new(190.2, 0.8, -25.6)) 
    p2.Character:MoveTo(Vector3.new(184.2, 0.8, -25.6))
end

while true do
    if game.Players.NumPlayers > 1 then
        wait(1.5)
        Fight()
    elseif game.Players.NumPlayers == 1 then
        gui.Text = "Waiting for 2 or more players."
    end
    wait()
end