How to testfor if an ArmorStand got killed?

How to testfor if an ArmorStand got killed? - Black and White Laptop

I'm working on a one-command creation that adds sports to Minecraft. I want to be able to testfor when you kill an ArmorStand. I tried to use the scoreboard command but it cannot be used for testing ArmorStand kills.
So, how do I testfor when a player kills an ArmorStand?

minecraft-java-edition minecraft-commands

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