(Portland, OR)  --  After a battle with tuberculosis, the Oregon Zoo's "Packy" is dead at age 54.  The elephant, who was a favorite of many zoo visitors, was euthanized yesterday morning.  He was the oldest male Asian elephant in North America.  The zoo's lead veterinarian, Dr. Tim Storms, tells KGW-TV the remaining treatments involved side effects that would have been very hard on Packy.  The elephant was born at the Oregon Zoo in April 1962.