User blog comment:Hihowru/Does Lelouch really die in the end?/@comment-182.64.54.38-20130305135308/@comment-105.237.21.34-20130723004657

Lelouch's father became immortal by taking V.V.'s "code", I believe that it was external injuries to V.V. that killed V.V.

It is also possible the other point you made, that Lelouch got whatever this "code" is from his father, the one his father got from V.V. but there aren't even any hints for that.

And lastly, I stand to correction on this, but I believe if you have this "code" you can't use geass: I vaguely remember C.C. saying something in those line in the first season. But they have the power to give others geass. And Lelouch still had geass, so he can't have taken a code. I will rewatch the first season to look for this