SeaWorld veterinarians in San Diego euthanized a nearly 42-year-old orca after it received lengthy treatments for an infection.
The company said in a statement that the killer whale named Kasatka died Tuesday evening "surrounded by members of her pod, as well as the veterinarians and caretakers who loved her."
Kasatka had been fighting a lung disease for years, but veterinarians made the difficult decision to euthanize the killer whale after her health and appetite "significantly declined over the past several days."
SeaWorld noted in a press release that this type of respiratory condition is the most common cause of mortality and illness in whales and dolphins.
"All of us at SeaWorld are deeply saddened by this loss, but thankful for the joy she has brought us and more than 125 million park guests," SeaWorld said in a release.
Kasatka was the company's second oldest orca and this is the second death of a killer whale in a month at one of SeaWorld's marine parks.