Twin Peaks will have a new sheriff when the cult show returns to TV screens next year (16) - actor Michael Onkean has opted not to reprise his role as Harry S Truman. A source tells TVLine.com Ontkean has retired from acting after playing Cousin Milo in 2011's The Descendants. Many of his Twin Peaks castmates will be returning for creator David Lynch's revamp, which will also feature newcomers Amanda Seyfried, Balthazar Getty and Peter Sarsgaard.