βFrom Wikipedia, the free encyclopedia. Michael O'Neill (born May 29, 1951) is an American actor. With a career stretching through three decades, he usually portrays senior law enforcement or military officers. He is perhaps best known for his role as Special agent Ron Butterfield, the head of President Josiah Bartlet's Secret Service detail, on The West Wing. He played CTU Administrative Director Richard Walsh in the first two episodes of 24. He played Sgt. Maj. Ron Cheals in the CBS action-drama series The Unit. He starred in the Season Six 2 part Finale of Grey's Anatomy as the broken widower who holds the hospital hostage with a 9mm while pursuing the doctors responsible for unplugging his wife. His most notable film performances occur in Seabiscuit, Secondhand Lions, Transformers, Dancer, Texas Pop 81, Traffic, Sea of Love, A Quiet Little Marriage, Nothing But the Truth, and Green Zone. O'Neill graduated from Auburn University in 1974. After attending Auburn he spent time under...
War of the Worlds
2025
Traffic
2000
Bride Hard
2025
Air
2023
Dallas Buyers Club
2013
Green Zone
2010
J. Edgar
2011
Jennifer Eight
1992
Transformers
2007
Seabiscuit
2003
Sea of Love
1989
Secondhand Lions
2003
Dreamcatcher
2003
Ghost Story
1981
The Legend of Bagger Vance
2000
Lorenzo's Oil
1992
The Sunchaser
1996
Around the Bend
2004
The Gun in Betty Lou's Handbag
1992
Nothing But the Truth
2008
Clemency
2019
Blind Justice
1994
Crazy
2008
Bushwhacked
1995
The Mod Squad
1999
Dancer, Texas Pop. 81
1998
ATF
1999
Danger One
2018
The Grim Sleeper
2014
Flying Lessons
2010
Indivisible
2018
For Their Own Good
1993
Standoff
1998
Awake to Danger
1995
A Quiet Little Marriage
2008
Victim of Love: The Shannon Mohr Story
1993
An Unremarkable Life
1989
Virtual Obsession
1998
The Stand at Paxton County
2020
American Crime
2004