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Thanydha Intarangkun, 36, of Thailand, also known as Koy Thanida, was a nurse studying English at the King's Education language school in the CTV building.
She died when the building collapsed during the earthquake.
Following the earthquake, Thai newspaper The Bangkok Post reported that Koy's father, pensioner Ruangyut Intarangun, had not heard from his daughter since the earthquake.
"We have tried to contact her, but we cannot reach her or any of her friends. We are so worried," said Mr Intarangun.