He was exposed to a fatal amount of radiation after saving Wilf.
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The Tenth Doctor receives a fatal dose of radiation and regenerates in part 2 of 'The End of Time', which was a seasonal special episode, Season 4, Episode 18.
Doctor Philastus Hurlbut died in 1883.
A Pathologist is the kind of doctor who performs autopsies on a person to determine cause of death.
NO SHE LEFT THE DOCTOR BUT DID NIT DIE BUT SUSAN DID INFACT DIE
Nick asked, 'Am i going to die?'.he didnt die though.
It is yet unknown as to how Jack became the Face of Boe. But was dying before the Doctor arrived, of old age, the face of boe finally died when he gave the rest of his energy to open the roof of the motorway.