Multiple choice general knowledge Oscar Winner for Best Actor 2005 Joaquin Phoenix - Walk the Line as Johnny Cash Heath Ledger - Brokeback Mountain as Ennis Del Mar Philip Seymour Hoffman - Capote as Truman Capote David Strathairn - Good Night, and Good Luck as Edward R. Murrow Reveal answer Fill a bubble to check yourself C Correct answer Explanation Philip Seymour Hoffman won the Oscar for Best Actor in 2006 (78th Academy Awards) for his portrayal of Truman Capote in Capote. His performance captured the author's distinctive voice and mannerisms during the writing of In Cold Blood.