The expression on the face of a prostitute killed in her Tai Po flat last year was so horrifying that a colleague barely recognised her, the Court of First Instance heard yesterday. Sun Xiumin, 30, was lying face-down on the floor with arms outstretched when her worried colleague's boyfriend discovered the mainland-born woman on August 15 last year, the murder trial of Nadeem Razaq, 24, was told. Mr Fung, the boyfriend, testified that Sun's eyes were protruding from their sockets and her lips had turned purple. The witness, whose first name was withheld for privacy reasons, said he performed cardio-pulmonary resuscitation on Sun, nicknamed Bobo, in vain. When his girlfriend, Ms Yeung, arrived at the flat, she asked Mr Fung about the identity of the woman on the floor, he said. 'Even Ms Yeung could hardly recognise it was Bobo,' he said. 'Her appearance was just too frightening.' Razaq has pleaded not guilty to three counts of murder in the deaths of Sun, Sze Ming-lan, 35, and Tse Hau-yuen, 35, in March last year. All three women, who operated one-woman brothels, were killed between March 14 and March 16. They were believed to have died from strangulation. Yesterday, Ms Yeung, also a sex worker, testified that a man matching Razaq's description approached her and another prostitute at a brothel down the street from Sun's flat. He 'stared aggressively' at the pair before leaving, the court heard. Sun was killed a short time later. Ms Yeung also testified that a man caught on security cameras entering her building was the same man who had stared at her. Earlier this week, jurors heard Razaq told police that he was 'forced' to kill the women after robbing them to repay gambling debts. Razaq also allegedly sent text messages to his brother from one of the victim's mobile phones, admitting he had committed the murders and asking for assistance. With the help of Razaq's brother, police intercepted the alleged killer in the early hours of March 16 at the Macau ferry pier, the trial has heard. During his opening address this week, prosecutor Arthur Luk Yee-shun SC told jurors that DNA matching Razaq's was found on a used condom and a bloodied garment at Sze's flat, a used condom at Sun's, a plastic straw at Tse's and nail clippings taken from her. Police also found four palm prints that allegedly matched Razaq's at Sze's flat, Mr Luk said. In all, 17 items including two mobile phones were taken from Razaq by police when they arrested him, the trial heard. The man admitted to taking the phones, one each from Sze and Sun, after he killed them, Mr Luk said during his opening address. Razaq also admitted he used one bank card stolen from one of his victims, the court has heard. Sze's husband grew worried when he could not reach her on either one of two mobile phones. Firemen discovered her lying face down, naked and with a shower hose wrapped around her neck. The trial continues before Madam Justice Clare-Marie Beeson.