|Hair color:||Blond (Dyed)|
|Aliases:||The Thin White Duke|
|First appearance:||Psych: The Movie|
|Last appearance:||Psych: The Movie|
William was Juliet O'Hara's criminal informant back in the day, providing the goods that helped put away numerous much more hardcore criminals than himself. However, Juliet still eventually sent him to prison, sparking the revenge plot which the movie hinges on.
Billy was apparently as obsessed with David Bowie as he was with Juliet, attempting in every detail to imitate 'the Thin White Duke', although the consensus of ally and foe alike is that the accent is off-target.