An American doctor accused of botching a string of operations while he was the chief surgeon at an Australian hospital was found guilty Tuesday of killing three of his patients and grievously harming another. Jayant Patel, 60, was ordered into police custody until he is sentenced on Thursday after a jury returned guilty verdicts on all charges against him. Patel, 60, had pleaded innocent to three counts of manslaughter and one count of causing grievous bodily harm to four patients he treated while working as director of surgery between 2003 and 2005 at a state-run hospital in Queensland state.