ISTANBUL (Reuters) - Turkish gunman Mehmet Ali Agca, who gravely wounded Pope John Paul in a failed assassination attempt in 1981, was grief-stricken over the Pontiff's death, Agca's brother said Sunday. Agca, now in an Istanbul prison, was mourning the loss of "a great friend," the gunman's brother Adnan Agca told Reuters. "He is extremely saddened, he is in grief. He loved the Pope," said Adnan Agca. "They developed a personal friendship while Mehmet Ali was (imprisoned) in Italy, and they had announced their brotherhood. "The Pope showed my brother and the rest of our family closeness. He was a...