John Mark Karr's arrest in Thailand after he had vanished for several years was a mixed blessing for his 85-year-old father. "I thought someone had killed him," Wexford Karr said Wednesday afternoon while sobbing during a telephone interview from his home in Atlanta. "This is such a surprise that he is alive." But learning his son was alive came with the news that his son, who is 41, was arrested in the Dec. 26, 1996, slaying of JonBenét Ramsey, he said. John Karr had disappeared after his release from jail in 2001. Karr, who relatives said had long spoken of...