Luke Grimes is in talks to star in 'American Sniper'.

The 30-year-old star - who had a recurring role in the sixth season of 'True Blood' - will join Bradley Cooper in the adaptation of 'American Sniper: The Autobiography of the Most Lethal Sniper in US Military History' by Chris Kyle, Scott McEwen and Jim DeFelice, according to

Cooper plays male lead Kyle in the Clint Eastwood-directed film which follows the story of his journey from being a Texas rodeo cowboy to a Navy SEAL chief.

Kyle - who was shot and killed at a shooting range near Texas in February 2013 - earned the title of the highest number of sniper kills in US military history with 160 deadly shots.

'American Sniper' recently recruited four new stars including 'Homeland' actor Navid Negahban - who starred as Abu Nazir in the popular drama - Nashville's Eric Close, Boardwalk Empire star Eric Ladin and Gang Related's Rey Gallegos.

Grimes will soon hit the big screen as Christian Grey's brother in 'Fifty Shades of Grey', and recently wrapped up 'Shangri-La Suite' alongside Emily Browning.

Filming starts at the end of March in Morocco.