From Wikipedia the free encyclopedia Michael ONeill 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 Bartlets 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 actiondrama series The Unit He starred in the Season Six 2 part Finale of Greys 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 ONeill graduated from Auburn University in 1974 After attending Auburn he spent time under the tutelage of actor Will Geer and his daughter Ellen at Theatricum Botanicum in Los Angeles before moving to New York to pursue his career there
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