The Clay County prosecutor says a confession to Kansas City’s only unsolved murder has been motivated by a born-again Christian prison inmate who wanted to clear his conscience. The killing happened in August of 1970. A murder charge has been filed against prisoner Robert Macon, who’s being held in the state priosn at Cameron. He’s 68 and is in prison for robbery and armed criminal action. The prosecautor says Macon has admitted shooting a man in North Kansas City in 1970. At the time, a team of 20 police officers went through 130 leads and never identified a suspect. The prosecutor says Macon also has admitted involvement in a bank robbery in 1965.