By Tim Kenneally LOS ANGELES (TheWrap.com) – “The Killing” is once again dead at AMC. The cable network has canceled the crime drama again, calling the latest cancellation a “difficult decision.” “We have made the difficult decision not to move forward with a fourth season of ‘The Killing,'” AMC said in a statement Tuesday. “We want to thank our great partners at Fox Television Studios, creator Veena Sud, an extraordinary cast and the dedicated fans who watched.” The series was canceled after its second season, but was later revived via a deal between Netflix and AMC. …