How to detect when randomly picked "killer" either dies or leaves game?

I am trying to make my loop break whenever the random chosen "killer" either dies or leaves game. I have been trying to figure it out for the last 4 hours and i'm in desperate need for help. Here is the script:

``local go = true

game.Players.PlayerAdded:Connect(function(plr) plr.CharacterAdded:Connect(function(char) while true do while wait(10) do if go == true then go = false local players = game.Players:GetPlayers() local killer = players[math.random(1,#players)] print(killer) game.ReplicatedStorage.KillerName.Value = killer

				--edit killer characteristics--
				local hat = game.ServerStorage.SpartanHelmet

				killer.Character.Humanoid:RemoveAccessories()
				killer.Character:WaitForChild("Shirt").ShirtTemplate = "http://www.roblox.com/asset/?id=11356448"
				killer.Character:WaitForChild("Pants").PantsTemplate = "http://www.roblox.com/asset/?id=11357134"
				local hatclone = hat:Clone()
				killer.Character.Humanoid:AddAccessory(hatclone)

				--add speed,health and jumpheight--
				killer.Character.Humanoid.WalkSpeed = 24
				killer.Character.Humanoid.MaxHealth = 200
				killer.Character.Humanoid.Health = 200
				killer.Character.Humanoid.JumpHeight = 10

				--show players name--
				local swordsmansign = game.ServerStorage.SwordsmanSign:Clone()
				swordsmansign.Parent = killer.Character:FindFirstChild("Head")

				--show killers picture--
				local Players = game:GetService("Players")
				local board = game.Workspace.Board.board.SurfaceGui.ImageLabel
				local userId = killer.UserId

				local thumbType = Enum.ThumbnailType.HeadShot
				local thumbSize = Enum.ThumbnailSize.Size420x420
				local content, isReady = Players:GetUserThumbnailAsync(userId, thumbType, thumbSize)

				board.Image = content
				board.Size = UDim2.new(0, 420, 0, 420)


				--show killers name--
				local label = game.Workspace.LabelPart.SurfaceGui.TextLabel
				label.Text = killer.Name

				--mapchange--
				local function selectmap()
					local maps = game.ReplicatedStorage.Maps:GetChildren()
					local selected = maps[math.random(1,#maps)]
					return selected
				end

				local randomizedmap = selectmap()
				print(randomizedmap)

				local randomizedmapclone = randomizedmap:Clone()
				randomizedmapclone.Parent = game.Workspace.Map
				
				print("Map installed")
				
				--I am trying to detect, if killer is still here then if their health is down to 0, then  break. but if killer left game then break.
			end
		end

	end

end)

end)

Sooo You Can Use PlayerRemoving

Example

game.Players.PlayerRemoving:Connect(function(plr)
	
	print(plr.Name.." Just Left The Game!")

end)

And For Died You Can Just Disable The Reset Button

local go = true

game.Players.PlayerAdded:Connect(function(plr) 
plr.CharacterAdded:Connect(function(char) 
while true do
while wait(10)  do 
if go == true then 
go = false 
local players = game.Players:GetPlayers() 

local killer = players[math.random(1,#players)] 
print(killer.Name) game.ReplicatedStorage.KillerName.Value = killer.Name

 local hat = game.ServerStorage:WaitForChild(SpartanHelmet)
killer.Character.Humanoid:RemoveAccessories()

if killer.Character:FindFirstChildWhichIsA("Shirt") then
killer.Character:WaitForChild("Shirt").ShirtTemplate = "http://www.roblox.com/asset/?id=11356448"
end

if killer.Character:FindFirstChildWhichIsA("Pants") then
killer.Character:WaitForChild("Pants").PantsTemplate = "http://www.roblox.com/asset/?id=11357134"
end

local hatclone = hat:Clone()
killer.Character.Humanoid:AddAccessory(hatclone)

killer.Character.Humanoid.WalkSpeed = 24
killer.Character.Humanoid.MaxHealth = 200
killer.Character.Humanoid.Health = 200
killer.Character.Humanoid.JumpHeight = 10

local swordsmansign = game.ServerStorage.SwordsmanSign:Clone()
swordsmansign.Parent = killer.Character:FindFirstChild("Head")

local Players = game:GetService("Players")
local board = game.Workspace.Board.board.SurfaceGui.ImageLabel
local userId = killer.UserId
 
local thumbType = Enum.ThumbnailType.HeadShot
local thumbSize = Enum.ThumbnailSize.Size420x420
local content, isReady = Players:GetUserThumbnailAsync(userId, thumbType, thumbSize)
  
board.Image = content
board.Size = UDim2.new(0, 420, 0, 420)

local label = game.Workspace.LabelPart.SurfaceGui.TextLabel
label.Text = killer.Name

local function selectmap()
local maps = game.ReplicatedStorage.Maps:GetChildren()
local selected = maps[math.random(1,#maps)]
return selected
 end

local randomizedmap = selectmap()
print(randomizedmap.Name)

local randomizedmapclone = randomizedmap:Clone()
randomizedmapclone.Parent = game.Workspace.Map
print("Map installed")

-- create another loop, constantly creating criteria to be met, if its not, then break

while true do
wait(1) -- how much we want to wait before checking again
local met = false

if killer then -- check if player is still in the server
local hum = killer.Character:FindFirstChild("Humanoid") -- check for humanoid
if hum then
if hum.Health > 0 then -- if player isnt dead
met = true -- continue checking
end
end
end

if met == false then -- if criteria is not met, then break
break
end
end

-- continue doing your thing after killer has died or left the game

end
end
end
end)