The first victim of this leopard was a villager of village Benji. For eight years, no one dared move alone at night on the road between the Hindu shrines of Kedarnath and Badrinath, for it passed through the leopard's territory, and few villagers would leave their houses. The leopard was apparently so desperate for food that it would break down doors, leap through windows, claw through the mud or thatch walls of huts and drag people from them, devouring them. The British Parliament requested the aid of Corbett in the autumn of 1925.
Corbett's notes revealed that this leopard, an elderly male, was suffering from serious gum recession and tooth loss. Analysis of many of the man-eaters taken by Corbett and other hunters has shown a pattern, in which the animals are too sick or compromised to hunt their normal prey, and thus turn to hunting humans, who are much easier to hunt and kill than wild game.
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source: wikipedia.org