Michael O'Neill

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Michael O'Neill
Born in Montgomery, Alabama, USA
Notable Roles Secret Service Agent Ron Butterfield in The West Wing
Ron Cheals in The Unit
Notable Episodes
Awards
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Contents

Roles

Guest Starring Roles

Series Role Episode Airdate
L.A. Law Mr. Moran 7x05 - My Friend Flicker November 19, 1992
Picket Fences Juror 2x18 - System Down April 1, 1994
The Pretender Captain Harrigan 1x10 - The Better Part of Valor January 11, 1997
Millennium County Prosecutor Calvin Smith 1x16 - Covenant March 21, 1997
The X-Files Patrol Captain 6x02 - Drive November 15, 1998
JAG Cmdr. Bradley 4x18 - Shakedown March 30, 1999
Roswell Phillip Evans 1x02 - The Morning After October 13, 1999
The West Wing Secret Service Agent Ron Butterfield 1x06 - Mr. Willis of Ohio November 3, 1999
The West Wing Secret Service Agent Ron Butterfield 1x16 - 20 Hours in L.A. February 23, 2000
Chicago Hope Bill Wyzinski 6x21 - Everybody's Special at Chicago Hope April 27, 2000
The West Wing Secret Service Agent Ron Butterfield 1x22 - What Kind of Day Has It Been? May 17, 2000
The West Wing Secret Service Agent Ron Butterfield 2x01 - In the Shadow of Two Gunmen (1) October 4, 2000
The West Wing Secret Service Agent Ron Butterfield 2x02 - In the Shadow of Two Gunmen (2) October 4, 2000
NYPD Blue Capt. Chuck Dowling 8x11 - Peeping Tommy March 20, 2001
Diagnosis Murder Caleb Mcaig 8x19 - No Good Deed April 27, 2001
The West Wing Secret Service Agent Ron Butterfield Special 1 - Isaac and Ishmael October 3, 2001
Boston Public Dr. Bernard Colbert 2x02 - Chapter Twenty-Four November 5, 2001
24 Richard Walsh 1x01 - Day 1: 12:00AM - 1:00AM November 6, 2001
24 Richard Walsh 1x02 - Day 1: 1:00AM - 2:00AM November 13, 2001
Boston Public Dr. Bernard Colbert 2x05 - Chapter Twenty-Seven November 26, 2001
Boston Public Dr. Bernard Colbert 2x06 - Chapter Twenty-Eight December 3, 2001
Boston Public Dr. Bernard Colbert 2x09 - Chapter Thirty-One January 14, 2002
The West Wing Secret Service Agent Ron Butterfield 3x18 - Enemies Foreign and Domestic May 1, 2002
Ally McBeal Dr. Colbert 5x21 - All of Me May 13, 2002
The West Wing Secret Service Agent Ron Butterfield 3x21 - Posse Comitatus May 22, 2002
Without a Trace Thomas Shannon 1x06 - Silent Partner October 31, 2002
Presidio Med 1x11 - Breathless January 24, 2003
The West Wing Secret Service Agent Ron Butterfield 4x20 - Evidence of Things Not Seen April 23, 2003
The West Wing Secret Service Agent Ron Butterfield 4x22 - Commencement May 7, 2003
The West Wing Secret Service Agent Ron Butterfield 4x23 - Twenty Five May 14, 2003
The West Wing Secret Service Agent Ron Butterfield 5x03 - Jefferson Lives October 8, 2003
The Practice Judge Robert Temple 8x11 - Police State January 11, 2004
The West Wing Secret Service Agent Ron Butterfield 5x20 - No Exit April 28, 2004
Judging Amy Dave Sherman 5x22 - My Little Runaway May 11, 2004
Crossing Jordan Chris Benz 4x02 - Out of Sight October 3, 2004
LAX Alonso Mathers 1x06 - Unscheduled Arrivals October 18, 2004
Boston Legal Dr. Robert McLean 1x13 - It Girls and Beyond January 23, 2005
ER Col. Ken Kilner 11x16 - Here and There February 24, 2005
Commander in Chief Congressman Wilcox 1x03 - First Strike October 11, 2005
The West Wing Secret Service Agent Ron Butterfield 7x20 - The Last Hurrah April 30, 2006
The West Wing Secret Service Agent Ron Butterfield 7x22 - Tomorrow May 14, 2006
The Nine Pete Burton 1x01 - Pilot October 4, 2006
The Nine Pete Burton 1x02 - Heroes Welcome October 11, 2006
3 lbs. James Wills 1x01 - Lost for Words November 14, 2006
Criminal Minds Det. Yarbough 3x06 - About Face October 31, 2007
Prison Break Director - Self's Supervisor 4x03 - Shut Down September 8, 2008
Prison Break Herb Stanton 4x12 - Selfless November 24, 2008
Prison Break Herb Stanton 4x13 - Deal or No Deal December 1, 2008
Ghost Whisperer Nolan 4x16 - Ghost Busted February 27, 2009
FlashForward Director Keller 1x05 - Gimme Some Truth October 22, 2009
Fringe Sheriff Velchik 2x12 - Edina City Limits January 14, 2010
Grey's Anatomy Gary Clark 6x19 - Sympathy for the Parents April 1, 2010
Grey's Anatomy Gary Clark 6x21 - How Insensitive May 6, 2010
Grey's Anatomy Gary Clark 6x23 - Sanctuary May 20, 2010
Grey's Anatomy Gary Clark 6x24 - Death and All His Friends May 20, 2010
NCIS Former NCIS Special Agent Riley McCallister 8x08 - Enemies Foreign November 16, 2010
NCIS Former NCIS Special Agent Riley McCallister 8x09 - Enemies Domestic November 23, 2010

Awards and Accolades

Trivia