How to detect a part being deleted?

I now of if part == nil then but I have multiple parts that are the same name. I need it to trigger a function every time one is removed. Is there a method?

Yeah, there is an even for that:

part.Parent.ChildRemoved:connect(function(child)
--Child is the part that got removed
end)

Now, it doesn't need to be exactly part.Parent, it's just the model that contains those parts.