The African elephant, a star of the neglected zoo, died on Sunday after suddenly falling ill, a day after having been active and playing with visitors.
"Top veterinarians... gave her the required medications... but she did not respond," Mohammed Rajai, who heads the government's central authority for zoos, said.
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A forensics report showed she had suffered a severe clot in the heart.
Her fans were quick to react on social media. "I loved her a lot," one user said in a Facebook post, while another wrote: "God relieved you, Naima darling".
Rajai said on television that elephants in captivity generally have shorter lives than those living in the wild.
"Elephants especially are social animals who usually live among their community," he said.
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