How do you know....

When a bush is dead? I have two crepe myrtles, one was moved last year and the other was not. The one that was moved looks dead, feels dead and is not got any green on it. The other one is greening up. I am afraid to dig the dry one up, because I have heard it is hard to kill a crepe myrtle. It has another 2 weeks or that baby is gone! If you have any suggestions....let me know.