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It is unclear if Jack is going to be a doctor because there is no information about who Jack is. A last name is required to fond information about him.
Captain Jack Harkness's real name is Javic Piotr Thane.
Jack Swigert died from cancer, specifically a malignant tumor in his right lung. He was diagnosed with cancer only a month before his death in 1982.
In Doctor Who, Captain Jack's full name is Captain Jack Harkness.
Captain Jack Harkness in "Doctor Who" was played by John Barrowman. He portrayed the character from 2005 to 2010 and made appearances in both the main series and its spin-off, "Torchwood."