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'''[[File:William_C._Vaughn_ALIAS_022-32-0445.jpg|thumb|William Vaughn's personal profile.]]William "Bill" Vaughn '''was the father of [[Michael Vaughn]] and was murdered by [[Irina Derevko]] on October 21, 1979.
'''Early Life ''' ==
Born Micheaux, Bill was a follower of Rambaldi, who got involved in decryption work for the organisation [[Prophet Five]]. In 1972 they gave portions of the code to a number of different individuals, but when the work was nearly completed, Bill realised that [[Prophet Five]] were killing the others. Managing to warn fellow targets [[James Lehman]] and Luc Goursaud, they fled with their families and changed their names, although [[Michael Vaughn]] was too young to remember this. Bill then joined the CIA, but was killed by [[KGB]] agent [[Irina Derevko]] in 1979, when Michael was 8 years old.
'''Season 3 ''' ==
[[File:Imagerttt.jpg|thumb| A Picture of Bill Vaughn's Team with him in the Middle Just Before he was killed by Irina Derevko in 1979.]]
'''Season 4 ''' ==
When visiting his dying, comatose uncle, [[Michael Vaughn]] comes into possession of a journal in his father's handwriting, with entries three years after his supposed death. His investigation put him in contact with someone who claimed that his father was still alive, and that they could provide his location. Confiding in [[Sydney Bristow]], [[Michael Vaughn]] stole the object of an [[APO]] mission for his mystery contact, going AWOL from [[APO]]. He took part in a mission they had organised to steal an artifact from a [[CIA]] convoy, but when he realised they'd lied about his father being alive, turned on them, bringing both objects back to [[APO]].
It's safe to assume that [[Thomas Brill]] was working for [[Elena Derevko]] as a ploy to get hold of a [[Rambaldi]] device,and that Bill was dead all along. He was killed by [[Irina Derevko]] in 1979.
'''Family ''' ==
*'''Son: '''[[Michael Vaughn]]
*'''Daughter in law:''' [[Sydney Bristow]]