When entity spawn using procedures, how do I give them the player’s armor?

I’ve been trying to make a feature for my infection mod, specifically for when the player gets infected and dies. Using the “Spawn Entity” procedure, I haven’t been able to give the resulting mob the same helmet or hold items of the player from before they died. Is there any way to make this possible? I would take any suggestion besides maybe coding since it’s a small part of a much larger procedure, but anything is better than nothing.