Merle Haggard in an upcoming biopic about the legendary country singer’s life.Robin Bissell – who directed Rockwell in The Best Of Enemies – will helm the project, and he will write the script with Haggard’s widow, Theresa Haggard, based on the singer’s memoir Sing Me Back Home.According to Deadline, Bissell and Haggard will produce the film together for Amazon Studios, who have grabbed the rights to the film and book.Rockwell is said to be in talks to take on the role of the country legend, and