
Michael Leonard Ontkean (born January 24, 1946) is a Canadian retired actor. Born and raised in Vancouver, British Columbia, Ontkean relocated to the United States to attend the University of New Hampshire on a hockey scholarship before pursuing a career in acting in the early 1970s.
He initially came to prominence portraying Officer Willie Gillis on the crime drama series The Rookies from 1972 to 1974, followed by lead roles in the hockey sports comedy film Slap Shot (1977) and the romantic comedy Willie & Phil (1980). In 1982, he had a starring role opposite Harry Hamlin and Kate Jackson in the drama Making Love, in which he portrayed a married man who comes to terms with his homosexuality. Ontkean continued to appear in films, such as Clara's Heart (1988) and Postcards from the Edge (1990) before being cast as Sheriff Harry S. Truman on David Lynch's Twin Peaks (1990–1991), the role for which he is best known.
Harry S. Truman
Lucius Harney
Dr. Charles McCamber
Dr. Field
Tommy
Willie Gillis
Frank Brandon
Gordon Brooks
John Scott
Cousin Milo
Lester Braddock
Tom Gentry
Greg Bradley
Stephen
Teddy Cooper
Wes Merritt
Cochea
Nick McGuire
Sheriff Harry S. Truman
Willie Kaufman
Ned Braden
Will
Drew Rothman
Mickey
Sheriff Harry S. Truman
Ward Thayer
Robert Munch
John Lee
Kenneth Taylor
Bill Hart
Jean
Zach
John Ryan
Robert
Hank Parnell
Eli Cooley
Willie Gillis
Chuck
Matthew 'Matt' Parker
Tom Keaton
Self
Christopher Wells
Peter Nichols
Mick Davidson
Jeff
Derek McKenzie
Frank Brandon
Curt Flynn
Jan DeBoer
Jeff Lisker
Jeff