Rex's fate, as with Ahsoka Tano's, hasn't been confirmed as of yet.
No one
First of all, Ahsoka and Rex's fates have not been revealed yet. So we do not know what happens to them yet. And since you said Naboo, you might be referring to the episode with that blue virus. No. Ahsoka and Rex were given an antidote that saved them from the fatal virus. Another clone and Padme were also saved.
no, captain rex does not die. at least... not yet..
Yes. El capitan shoots her
Rex's fate has not been revealed
Rex Rowland died in 2004.
Rex Wilson died in 1951.
Rex Paterson died in 1978.
Rex Battarbee died in 1973.
Rex Brinkworth died in 1998.
George Rex died in 1839.
Marcus Rex died in 1971.