A 21-YEAR-OLD student died yesterday after apparently receiving an overdose of chloroform from a man who attempted to rape her in a hotel. The man's mistress was alleged to have been watching as he used a video camera to record the attack on Baptist College student Elaine Luk Yee-ling. Police yesterday arrested the 32-year-old owner of the Tuen Mun-based Yat Tin Property Agency and a 28-year-old female employee. Ms Luk, a second-year computer student, had taken up a summer job with the property agency. On Saturday she was invited by the woman to join her at the Royal Garden Hotel in Sha Tin for a birthday party and it was suggested she could get $10,000. Ms Luk went to a suite where her employer and the woman were waiting. But when she went in, she was allegedly given chloroform at least twice. It is believed that after falling unconscious on a bed she was stripped by the man who attempted to rape her in the presence of the woman and with a video camera running. When Ms Luk could not be woken she was taken to Prince of Wales Hospital by ambulance on Saturday night. No report was made to police, but officers at the hospital became suspicious. Ms Luk, who lived with her family at Tai Hing Gardens, Tuen Mun, died in hospital at 1 pm yesterday without regaining consciousness. Detective Senior Inspector Dickie Lee Tat-kin, who is heading the investigation, said the case had been classified as homicide. ''We suspect Ms Luk might have died from an overdose of chloroform,'' Inspector Lee said, adding that a post mortem examination would be performed today. The couple were arrested in the hotel room and they helped detectives recover a video camera from the bed of the Shing Mun River. The film in the camera was damaged. No charges have yet been preferred against the couple.