Robert Downey Jr full interview: star walks out when asked about past

Robert Downey Jr talks super heroes, Iron Man and his latest movie Avengers: Age of Ultron. But when the questions turn to his family and colourful past, the film star the interview with Channel 4 News presenter Krishnan GuruMurthy to an abrupt end. Sign up for Snowmail, your daily preview of what is on Channel 4 News, sent straight to your inbox, here: Missed Channel 4 News Catch up on the last seven days here: