Explosion not spawning in the correct position?

I've made a script where if the player touches the ground an explosion spawns in his head and he dies. But for some reason it spawns at 0,0,0 not the head position.

local part = script.Parent

part.Touched:connect(function(hit)
	local countdown = game.ReplicatedStorage:WaitForChild('Countdown')
	
	local character = hit.Parent
	local humanoid = hit.Parent:FindFirstChild('Humanoid')
	
	if humanoid and character and countdown.Value > 1 then
		Instance.new('Explosion', character.Head)
		humanoid.Health = 0
	end
end)