PITTSBURGH — An American doctor accused of killing a lion in an illegal hunt in Zimbabwe said Tuesday that he had complied with all rules and regulations, filled out all the necessary paperwork and obtained the correct permits. The Zimbabwe government said Sunday that Dr. Jan Seski of Murrysville, Pennsylvania, used a bow and arrow in April to kill a lion without approval, on land where such hunting was not allowed. But in a statement issued by his attorney, Seski said he had engaged in a “lawfully permitted hunt” and that it happened in July, not April, as Zimbabwe officials had said. “During this trip, Dr.