It took long enough, but after managing to infect roughly half of the elephant herd with tuberculosis and euthanizing two younger bull elephants, Metro Oregon Zoo in Portland finally managed to take out 54 year-old Packy, who was also suffering from tuberculosis. Another couple of months, and he'd have been 55. Still, he was the oldest Asian bull in captivity in North America, and something of a global icon. Born in Portland April 14, 1962, he was the first elephant born in the Western Hemisphere in 44 years - seven others were born previously, but all died within a few years. Packy, by contrast, was a survivor - at least, until new management took over at Metro Oregon Zoo.
Previously, great care was taken to insulate the elephants from zoonotic diseases, which are transmissible from humans to elephants. Subsequent managers decided that they should do things like take elephants for walks through public spaces; choosing to ignore warnings of potential health threats to the animals by exposing them to areas in which over a million people from around the world tread.
Unsurprisingly, as all it takes is for one person with TB to spit on the grounds, they managed to infect the herd. It's very possible that the remaining elephants are infected with the latent disease as well, but have yet to demonstrate indications.