Can someone help me out with this knife kill script, it's erroring out /: ?

So I have a murder game and i'm trying to make a kill script, that if I click someone's root part or Torso, they die. But it's just erroring and ugh... I just need help. This script is a server script inside of serverscriptservice.

Script:

game.Players.PlayerAdded:Connect(function(player)
	local Mouse = player:GetMouse()
	if player.Backpack.EquippedTool == "DefKnife" then
		if Mouse.Target.Parent.Name == "HumanoidRootPart" or "Torso" then
			Mouse.Target.Parent.Parent.Humanoid.MaxHealth = 0
		end
	end
end)

The issue here is in your if statement on line 4.

I believe your intention is to check if Mouse.Target.Parent.Name is "Humanoid" or "Torso", but you are checking if Mouse.Target.Parent.Name == "HumanoidRootPart" then, and separately checking if Torso then rather than if Mouse.Target.Parent.Name == "Torso" then.

Also, instead of setting the MaxHealth to 0, you could use the TakeDamage method from Humanoid, or simply set Health to 0.