The cub from the Marsh Pride, which featured in the popular BBC television series "Big Cat Diary," had been separated from others after being poisoned, leaving it vulnerable to an attack by buffalo that caused internal injuries, said Kenya wildlife Service spokesman Paul Udoto.
The male cub, named Alan, was receiving treatment but deteriorated rapidly this morning and was put down by Kenya Wildlife Service veterinarians, Udoto said. Two other lions have already died from the poisoning.
The remains are presumed to be that of Sienna, another member of the pride that has not been seen since the incident occurred.
The lions were poisoned after they attacked and killed two cows belonging to Maasai herdsmen who let their cattle graze in the Masai Mara Game Reserve in western Kenya.
Three people have been arrested but one has agreed to become a prosecution witness, hence it's likely no charges will be brought against him, Udoto said.
The poisoning hasn't only affected the lions but seems to have moved through the food chain. Nine vultures have been found dead near the remains, Udoto said.
Land division and urbanisation have reduced the traditional grazing lands of the Maasai herdsmen who have responded by allowing their cattle to roam on the plains of the game reserves.
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