We know this is a sad matter. Let's help him get the right information out so this doesn't happen again.
Check out this video as it provides thoroughly how to care for a chameleon and provide proper husbandry.
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I am sorry for your loss. I noticed you mentioned dripper. Dehydration is one of the number one cause of death for Chameleons. Always mist their cages and you can mist them a little ( once a week ) to help clean their eyes out. Drippers doesnt really provide that much hydration. They drink water...