Who played Ennis Del Mar in 'Brokeback Mountain'?

Who played Harry Burns in 'When Harry Met Sally...'? In which film is Harry Burns a character? Who played Sally Albright in 'When Harry Met Sally...'? Who played Annie Wilkes in 'Misery'? In which film is Ennis Del Mar a character? Who played Jack Twist in 'Brokeback Mountain'? Who played Louis Bloom in 'Nightcrawler'? In which film is Louis Bloom a character?