A man and a woman wanted in connection with the murder of a University of Hong Kong graduate in Tai Po last week, were found dead in an apparent suicide pact on Cheung Chau yesterday. The man, 27, and the woman, 20, were found on a bed in a ground-floor flat at the Bella Vista Villa at about 4pm. An electric rice-cooker containing burned charcoal was near the bed. One of the man's thumbs was tied to one of the woman's fingers. Police found three identity cards on them. The couple rented the holiday flat at 1am on Sunday and were supposed to check out at 2pm yesterday. Their bodies were discovered by an employee. The pair came under police suspicion after witnesses told detectives they had seen a man and a woman at a house in San Tau Kok village before the body of Lau Wai-yee, 23, was discovered on Friday morning. Police believe the couple had stayed in the village house and that they had removed evidence from it. Lau, a graduate in electrical engineering, was believed to have been murdered after she went to give her first lesson as a private tutor in Tai Po last Wednesday. She was believed to have been killed by suffocation or blows to her head. A pathologist estimated she had died about 36 hours before her body was found. Lau had placed an advertisement in a Tai Po supermarket and received a call from a man seeking tuition for his sister. She arranged to meet him outside a restaurant in Ting Kok Road, Tai Po. She phoned her boyfriend at 8.45pm and arranged to meet him in Tung Tsz Village after the lesson but did not show up. Her boyfriend was unable to contact her on her mobile telephone and Lau's family alerted police at 1am on Thursday. Her body was found by a villager at 10am the following day. Lau worked for a company in Tai Po Industrial Estate and lived with her parents in Kwong Fuk Estate, Tai Po. She was the family's main breadwinner. She had a teenage sister, and her boyfriend was a former schoolmate of hers. The killing came months after two other women offering private tuition were robbed by a man who answered their adverts in supermarkets in Shekkipmei.