Yes, the courts and judges will rule in favor of the plaintiff if the defendant has been deemed as properly served, even if the defendant is dead.
However, there are a boat load of homeless people with no “Last known” or “permanent address” that are completely off the radar.
IMO, it comes down to this, Can you have a million dollars in the bank or in cash and claim or actually be homeless ?
No Address ?
Not belonging to any State ?
For certain purposes, you legally have a "domicile," which can be only changed by adopting a new "domicile." So if you leave your permanent address in, say, Nevada, and go bumming around the country with no new fixed address, you are legally considered to still be a "domiciliary" (and citizen) of Nevada until you establish a domicile elsewhere.