Country star Glen Campbell's lifestory is about to be turned into a new movie by the man who produced Johnny Cash biopic Walk the Line. Moviemaker James Keach has just signed on to develop a film based on the Wichita Lineman singer's amazing story from talented studio guitarist and part-time Beach Boys star, through his heyday as a music and TV superstar, to his drink and drug woes and his current battle with Alzheimer's Disease.