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 Challies died in 2003.
Rex Layne died in 2000.
Rex Mason died in 1975.
Rex Corbett died in 1967.
Rex Roe died in 2002.
John Rex died in 2011.
Rex Mortimer died in 1979.