From what I know, you'll know if your T is dead just by looking at it. Almost 100% of the time, they have all their legs curled under their body.
As for your spider being lethargic, it could be normal. As T's get older and bigger they usually aren't as active and start hiding out for long periods of time. It's also not uncommon for them to fast for quite some time. I don't know the size of your T but if it has a 2" legspan or more I wouldn't worry too much as they are more robust at that size.
As for things you can check: I would say temps would be first, some T's get very inactive when the temps go down. Make sure it's in the right gradient for your species. Same with humidity.
Pixie
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Keeper of 5 snakes, leopard geckos, 1 green iguana, 20+ tarantulas, 2 dogs & a bunch of rats!
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