Police have launched a manhunt for a Chinese national who they believe is responsible for the death of a 22-year-old Thai woman at a hotel in Bangkok's Bang Kapi district last week.

The woman, identified as Airada, was hired through a modelling agency to entertain a Chinese client, identified only as Duoying. Police learned the agency's models are often expected to take drugs during their time with their clients. 

CCTV footage from the hotel showed the man checking in at 11.16pm on Feb 9. Airada was seen entering the man's room at 2.52am, but at 6.16am, the man was seen leaving the hotel room without her. No one else was seen coming in or out of the room.

A few hours later, hotel staff found Airada lifeless inside the room and called the police. Officers found no sign of injury or a physical struggle on the victim's body.  

Police have also sought a warrant for the arrest of the Chinese man. Police are trying to find him.

Airada's sister said an agent claiming to be from the modelling agency had contacted her on several occasions, saying the Chinese client was willing to pay 100,000 baht to cover her funeral expenses. The agent then raised the offer to 200,000 baht, which the family rejected, she said.

Then a man claiming to be a police officer contacted the family and urged them to accept a 500,000-baht compensation offer, she said.