How do I put a script inside a player's body parts when it dies?

Before anything else, I just like to mention that I'm an absolute noob in scripting. I know there is a lot to improve on the script I will show you. The redundancies might make you cringe.

I'm trying to make a death effect similar to getting shot by the Hyperlaser Gun gear. So, whenever a player dies, the body parts become anchored and transparent; selection boxes and lights will appear and fade out; and eventually the parts are destroyed. I made a function that does exactly that.

THE PROBLEM: * I have no clue how to integrate the function into a player's body parts whenever someone dies.*

I heard it has to do something with the "Died()" event. How do I do it?

Here's the "HyperDeath" function

local function HyperDeath(instance)	
	local function SelectionBoxify(instance)
		local selectionBox = Instance.new('SelectionBox')
		selectionBox.Adornee = instance
		selectionBox.Color = BrickColor.new('New Yeller')
		selectionBox.Parent = instance
		selectionBox.Transparency = 0.3
		return selectionBox
	end
	
	local function Light(instance)
		local light = Instance.new('PointLight')
		light.Parent = instance
		light.Color = Color3.new(255,255,0)
		light.Range = 7
		return light
	end
	
	local function Freeze(instance)
		local part = instance
		part.Anchored = true
	end
	
	local function Hide(instance)
		local part = instance
		part.Transparency = 1
	end
	
	local function FadeSelection(instance)
		local part = instance.SelectionBox
		local increment = 0.05
		while part.Transparency < 1 do
			part.Transparency = part.Transparency + increment
			wait()
		end
	end

	local function Vanish(instance)
		local part = instance
		part:Destroy()
		part.Parent = instance
	end
	
	
	SelectionBoxify(instance)
	Light(instance)
	Freeze(instance)
	Hide(instance)
	wait(0.5)
	FadeSelection(instance)
	wait(1)
	Vanish(instance)
end

Am I on the right track? Or am I totally way off? Thank you in advance for your feedback. :D

In your gun, you should check if Humanoid.Health-Damage is <=0 and if so, run

local p = Humanoid.Parent:children()
for i=1,#p do
	if p:IsA("Part") then
		coroutine.wrap(HyperDeath)(p)
	end
end

The confusing part of that snippet is the part about coroutines - because your function has wait(0.5) and other waits in it, each function call would wait before returning so it would only do the effect at one part of the character at a time. Also make sure that "Humanoid" in the above snippet is the character's humanoid, the variable might be named "human" in your gun instead.