Article Photos: Zoo: Liver problem to blame for panda cub death 4/4

  The National Zoo's giant panda Tian Tian eats a frozen fruit treat at zoo in Washington, Thursday, Oct. 11, 2012. The zoo announced Thursday that the recent death of Tian Tian and Mei Xiang's cub was due to liver and lung damage. (AP Photo/Jacquelyn Martin)