Avatar actor linked to Texas Killing Fields According to Variety, Sam Worthington has joined the cast of murder mystery Texas Killing Fields. The story follows two police officers who take on a case of disappearances and homicides, stretching back 20 years and 60 victims, in the wastelands surrounding Gulf Coast refineries. The Avatar actor will play a local cop who teams up with a New York officer to track down the murderers. Michael Mann (Heat, Public Enemies) is producing the movie. His daughter Ami Canaan Mann will direct the picture.