Can Harry Potter use avada kadavra?

Harry Potter does not use Avada Kedavra because he doesn't believe it is right to kill someone. Therefore, Harry always tries to do something else first, only killing someone as a last possible act of self defense. Even when Harry defeated Voldemort, he did not use the Avada Kedavra curse. Voldemort's own curse rebounded when he tried to use it against Harry, and that is the curse that killed him.