About
William Duffy is an actor.
Known for
Law & OrderSeries • 1990
The MentalistSeries • 2008
NCISSeries • 2003
Criminal MindsSeries • 2005
It's Always Sunny in PhiladelphiaSeries • 2005
Beverly Hills, 90210Series • 1990
The West WingSeries • 1999
HeroesSeries • 2006
ScandalSeries • 2012
BoschSeries • 2015
The O.C.Series • 2003
ParenthoodSeries • 2010
The DivisionSeries • 2001
American DreamsSeries • 2002
Hearts AfireSeries • 1992
Blast from the PastMovie • 1999
Sniper 3Movie • 2004
KarlaMovie • 2006
The Two JakesMovie • 1990
Waist DeepMovie • 2006
Death GameMovie • 1977
A West Wing Special to Benefit When We All VoteMovie • 2020
BrainstormMovie • 1965