Topeka (WIBW) The Topeka Zoo says tests show a lowland gorilla died over the weekend of a ruptured aortic aneurysm.

Zoo director Mike Coker says zoo staff found M’Bili, a male Lowland gorilla, dead around 7:30 am Saturday in his night quarters. He was 17 years, 8 months old.

Coker says M'Bili had not been exhibiting any outward signs of illness or distress.

Kansas State University School of Veterinary Medicine conducted the necropsy. Coker says histopathology results are pending and will be provided when available with in the next few weeks.

M’Bili was born at the San Diego Wild Animal Park on February 15, 1992. He had been residing at the San Diego Zoo before his arrival at the Topeka Zoo in December 2001.

M'Bili's death leaves the Topeka Zoo with one Lowland gorilla Tiffany.

M'Bili's death comes at a time when the zoo is undergoing an independent review after being cited with improper care in several animal deaths.