What happens to Something Awful LLC's corporate debt and tax issues now that Lowtax is dead? Does it just fizzle out since there's nobody left to pay it or is Jeffrey going to have to take ownership of the LLC, debt included, if he wants to keep running the site?
Short answer: If SA LLC owed you money, you are fucked.
Longer Answer: the LLC (to be specific, Lowtax's stake of SA LLC [its 100%, but speaking in general]) goes with the estate. If not sold/transferred (and that's very unlikely as SA LLC has negative value) the LLC has an unwind period where people can file claims against the LLC. To tl;dr SA LLC as assets has like two boxes of Moofwear and a $5 loyalty credit to Goldbelly - if your claims exceed that, you can try to sue the entity to claw back money. I.E. If you believe that $450,000 was too low for the forums you can try to open a fraud case saying the LLC firesaled their assets to deny you funds/damages. (You could also try to sue/charge Jeff-o if you believed he participated in the fraud, but that seems unlikely to succeed).
LLCs are, by name as Limited Liability Corporations, are designed to limit the liability of the owners so that unlike a filed Sole Proprietorship any claimants can't come after your personal assets/accounts. The liability limited is the assets of the corp.
But, given Lowtax was treating the LLC as his personal piggy bank and spending it all on Hearthstone, you'd have a pretty solid case. But the major issue is that Lowtax is dead, and momtax is dead, and Lowtax's estate is valued at one Robocop painting, a picture (unhung) of some black lady, and a (used) Five-Seven pistol, and there are many other claimants including the government. There is no one to jail and no money to claim.
So what you likely do is open a token case, get a judgement, get the judgement ruled in default, and then take the tax write off.