SAN ANTONIO -- The San Antonio Zoo announced on Monday morning the loss of Boo, an Asian elephant and former circus act. She was 59 years old.

Boo was euthanized on Sunday after debilitating weakness had become apparent and quality of life had vanished, according to a press release.

The zoo says several blood tests that showed abnormal cells indicative of lymphoma or blood cancer.

She was brought to the zoo in 2010 from a private owner in Houston. Boo used to perform in the circus.

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