From Wikipedia, the free encyclopedia. Walter Matthau (October 1, 1920 – July 1, 2000) was an American actor best known for his role as Oscar Madison in The Odd Couple and his frequent collaborations with Odd Couple star Jack Lemmon, as well as his role as Coach Buttermaker in the 1976 comedy The Bad News Bears. He won an Academy Award for his performance in the 1966 Billy Wilder film The Fortune Cookie. Description above from the Wikipedia article Walter Matthau, licensed under CC-BY-SA, full list of contributors on Wikipedia