Two men who abducted and beat a woman to death over a period of three days pleaded guilty to manslaughter yesterday. Chau Ka-wai, 23, and Lai Wing-kong, 30, admitted killing O Oi-chu, 54, who had run up a gambling debt of $74,000. O's body was found in a stairwell at Chi Pak Villa in Po Kwu Wan Road, Kowloon, on January 18 last year. Mr Justice Colin Jackson adjourned sentencing until this morning. The court was told that O's body had 96 external injuries. A number of her fingers had been crushed with pliers and she had also suffered multiple rib fractures. Prosecutor Peter Power told the Court of First Instance that O was playing mahjong in North Point at about 3.30am on January 13, when she was confronted by the two men. They took her to a brothel in Chi Pak Villa. Two days later, one of O's sons received a telephone call telling him his mother would be held until she repaid the debt. Another of her sons also received a phone call concerning the repayment. The final call came on January 17. A cleaner found O's body the next day. Mr Power said both men fled to the mainland after the killing but were arrested when they returned to Hong Kong in May last year. Chau told investigators he had begun slapping O because her attitude infuriated him. She was then beaten in a room attached to the brothel over the course of 75 hours. Chau slept by the doorway with O's hand tied to his to prevent her from escaping. He said that after she fell unconscious he had carried her downstairs to see a doctor, but gave up and left her in the stairwell.