Forum:Why must the Doctor die? What's at stake?

I must be very dense or not paying very much attention to the plot, but I still don't understand why the Doctor must die. In The Wedding of River Song, Dorium tells the Doctor that he needs to stop running away from his death because "now [he knows] what's at stake." Please explain?Siennafox talk to me 19:42, October 2, 2011 (UTC)