O'Dowd set to star in Armstrong biopic

Ben Foster and Chris O'Dowd will star in a biopic about Lance Armstrong.

The 32-year-old actor - who was first linked to play the disgraced cyclist in July - has officially signed on for the lead role in Stephen Frears' biographical film, while O'Dowd will play journalist David Walsh, who was one of the sports writers that uncovered Armstrong's performance-enhancing substance abuse.