The Doctor's death
Much like their origin, the Doctor's death was a matter of conflicting accounts and alternate timelines. (PROSE: Alien Bodies, TV: The Impossible Astronaut, The Name of the Doctor)
Through their ability to regenerate, the Doctor was able to "cheat death" on numerous occasions. (TV: The Tenth Planet, The Parting of the Ways) However, the Tenth Doctor noted that he could be killed without allowing for regeneration. (TV: The End of Time) As such, the Doctor was not truly immortal, which the Fifth Doctor deemed impossible even for a Time Lord. (TV: The Five Doctors) Even allowing for regeneration, the Tenth Doctor regarded the change it entailed as a form of death. (TV: The End of Time)
It was a matter of historical record that the Eleventh Doctor was killed at Lake Silencio, Utah on the planet Earth at 5:02 PM on 22 April 2011 at the hands of River Song, born Melody Pond. Knowing this, the crew of the Teselecta, a ship of the Justice Department which operated to inflict "hell" on unpunished criminals, deviated from their mission to punish Adolf Hitler when they discovered River. It was through this encounter that a younger version of the Eleventh Doctor became aware of his recorded death. (TV: Let's Kill Hitler)
