March 4 (UPI) -- Talks between NFL Films and North Carolina coach Bill Belichick failed to produce an agreement for the Tar Heels to appear this off-season on Hard Knocks , a spokesman for NFL Media told UPI on Tuesday. "NFL Films had discussions with Coach Belichick and UNC about appearing on Hard Knocks this offseason, but couldn't reach an agreement," said the spokesman for NFL Media, which includes NFL Films among other media properties. Advertisement North Carolina did not immediately