KABUL, Afghanistan (AFP) - An Afghan radio journalist was shot dead Friday in a car ambush in the central province of Ghor, officials said, the fifth media worker to be killed in two months.Besmullah Adel Aimaq, editor-in-chief of Voice of Ghor radio, was killed en route to Firoz Koh city, the capital of Ghor province, said Aref Aber, the governor's spokesman.