I read a theory that the Doctor's mother and the man who were forced to cover their faces in shame became the first two Weeping Angels because covering the face like the Weeping Angels do was a Gallifreyan symbol of shame and the Weeping Angels evolved to feed off Time Energy since they were denied that once they were no longer Time Lords and Ladies.

The story of how Clara Oswin Oswald (the impossible girl) finally dies. Please enjoy!

Alone and grieving, the Doctor is doing everything he can to avoid death, but he can't avoid River Song. With his death knell sounding in his head, the Doctor has to face thirty-two hours trapped with a woman he can barely stand, who knows him better than he wants to accept. But it's what River doesn't know that can make this night one of the most important he has left.