Called when the entity is about to be removed.
See also Entity:CallOnRemove, which can even be used on engine (non-Lua) entities.
Create an explosion when the entity will be removed. To create an entity, you can read ents.Create.
Issue Tracker: 4675
This hook may be called at odd times (when entity has actually not yet been removed from the server). This happens during fullupdate with the ENTITY:Initialize function not being called even when the entity reappears. You can debug this behaviour by enabling cheats and running cl_fullupdate on the client.
GM:NotifyShouldTransmit can be used to circumvent this problem. ENTITY:Think can also be used to detect that the entity has reappeared. You may reinitialize any necessary data in these hooks. Another way to fix this problem can be found at the bottom of this page.