Police stumbled on a horrific scene after they were called to a Kwai Chung flat on March 7 last year. Li Yui-yi, 19, was on the living room floor, her severed head placed by her side. The receptionist's torso had been stabbed dozens of times. Li's ex-boyfriend, Leung Pak-ming, 26, was inside the flat, his clothes stained with her blood, and two knives were found near Li's body. Leung admitted killing and then beheading Li shortly after arriving at the flat where she lived with her family, the Court of First Instance heard at the opening of Leung's murder trial. Leung bought the weapons a day before the killing, the court was told. Prosecutors rejected his offer to plead guilty to the lesser charge of manslaughter. 'The accused admitted killing the deceased,' senior public prosecutor Polly Wan Shuk-fong, said. 'He has no excuse or justification of any kind. The deceased, Ms Li, was left with no chance at all to live ... This is not a case about provocation.' A psychiatrist would testify that Leung was depressed and suffered from an adjustment disorder after the couple's turbulent nine-month relationship ended, the trial heard. But there was nothing that suggested Leung was mentally impaired and there were no drugs or alcohol in his body, Ms Wan said. Li had begged Leung to stop his frenzied attack, the prosecutor said. 'He cut off her head to be sure she was dead,' Ms Wan told jurors. In the days before Li's death, Leung had called the women repeatedly and sent her dozens of unanswered text messages. They oscillated between professing his love to demands that Li repay him HK$12,000 in expenses from when they had briefly lived together. 'These 9 months are the happiest days in my life!' one of Leung's text messages said. 'I became crazy, really crazy! I loved you so deeply, but yet gave you pain!' Leung had tried committing suicide twice in an apparent bid to keep Li, the court heard. Yesterday, Leung wept in the dock as Li's sister, the first prosecution witness, sobbed and was unable to testify. Her witness statement was read aloud in court. One day before the killing, Li's sister and her boyfriend, Wong Ying-pang, filed a police report over Leung's continuing harassment, the trial heard. The couple ran into Leung at the bus stop near the family's flat on the morning of Li's death. He told them he wanted to return a bag of clothes to Li, but the couple lied about her being at work and said they would return the bag. Leung declined an offer to share a taxi and said he would find his own way home, Mr Wong said. He then apologised for the discord between him and the victim. 'We told him to take good care of himself,' Mr Wong said. 'He did not seem to be nervous - just his usual self.' Leung later returned and stabbed Li. Cheng Hau-yu, a friend of the defendant and victim, testified that Leung called her at work to confess to the killing. 'I was very shocked. I asked [Leung] if he was serious or joking. He said he was not joking and asked me to call police for him. Then the line got disconnected.' Ms Cheng said she asked Leung if he knew the consequences. 'He answered that he would be sent to prison.' The trial before Mrs Justice Verina Bokhary continues today.