SAN ANTONIO -- San Antonio Zoo officials announced Monday their female Asian elephant "Boo" was euthanized Sunday.
Zoo officials said they made the decision after a "debilitating weakness had become apparent" and Boo's "quality of life had vanished."
Several tests were performed to determine a cause for Boo’s declining health, and blood tests revealed abnormal white blood cells indicative of lymphoma or blood cancer.
Boo was 59 years old.