no one knows for sure
Sir Rex Harrison died on June 2, 1990 at the age of 82.
T-rex may have lived until 65 million years ago when the great extinction occur.
In the Star Wars movies Rex did not exist ,but in the cartoon Star Wars The Clone Wars he does exists and has not died yet. Now I am positive that he is going to die in the third Star Wars movie as...
Rex's fate is unknown, just like Ahsoka's fate still has to be revealed
he died of influenza