From ANIMAL PEOPLE, July/August 2009:
Sam the koala, rescued by firefighter David Tree during
bushfires that killed more than 170 people in northern Victoria
state, Australia, in February 2009, was euthanized on August 6,
2009 due to incurably painful cysts caused by urogenital clamydiosis.
The disease afflicts as much as half of the koala population.
Dunham, a dolphin rescued from stranding shortly before
Christmas 2008 and rehabilitated by Gulf World, was euthanized on
July 21, 2009 due to injuries suffered when he was mauled by a tiger
shark soon after his release. Harbor Branch Oceanographic
Institution director Stephen McCullogh saw the attack but was unable
to prevent it.