The incident.
9 At about 10.00 pm on Saturday 13 September 2008, Malcolm Potts caught a train from Ashfield to Central Station. He then walked to Kings Cross. During the early hours of the following morning, Sunday 14 September 2008, he approached Emma King, who was then working as a sex worker in Kings Cross. The first time he did so, she told him to come back in approximately an hour. He returned at about 4.00 am. He explained that he lived at Ashfield. They agreed upon a price and then caught a taxi to his unit at Ashfield.
10 Mr Potts gave evidence during the trial. He said that they spoke during the taxi ride and he asked Emma King whether she used drugs. She said she did not. He then asked her whether she had any medical problems. According to his evidence, she responded saying that she had HIV.
11 I should deal with that evidence at this point. It was an important aspect of Mr Potts' explanation for what went wrong in his dealings with Emma King that morning. I am satisfied that, at least so far as the aspect concerning HIV is concerned, no such conversation took place. I have reached that view for a number of reasons. First, the account given by Mr Potts is inherently improbable. It involves a denial by a drug user of drug use, and yet an acknowledgment of HIV. It would, perhaps, not be surprising were a sex worker to admit to a drug problem since, notoriously, many pursue that vocation by reason of a drug addiction. However, it is inherently unlikely that someone in Ms King's situation would deny being a drug addict, and yet acknowledge HIV, when she was about to engage in sexual intercourse with a potential customer. Secondly, Ms King's partner gave evidence of Ms King's practice when dealing with clients. She was familiar with that practice. She asserted, and I accept, that Emma King never told clients that she had HIV. She would, however, insist upon safe sex. If she believed that someone wanted unprotected sex, she would refuse to do business with them (T 89).
12 Thirdly, in cross examination, Mr Potts acknowledged that he had been served with the Crown papers, which he had read (T 381). They included the autopsy report relating to Emma King. The report referred to the fact that the deceased was HIV positive. That, I believe, was the source of Mr Potts' knowledge, not a conversation with Ms King.
13 There is a further reason for rejecting Mr Potts' account. It is clear that, after death, Malcolm Potts had unprotected sexual intercourse with Emma King, as I will shortly describe. I do not believe he would have done so had he known that she was HIV positive.
14 Having arrived at the flat, Mr Potts said that Emma King wanted to sort out the money in advance. They had agreed upon a price which he said was $100 (T 370). However, he acknowledged in cross examination that it may have been $200, as he had told certain doctors (T 379). When the flat was searched after his arrest, he had slightly over $100 (T 499).
15 Returning to Mr Potts' evidence, he said that he left her presence to go to the kitchen. He may then have realised that he did not have enough money. But, whether that be right or wrong, he said that, once in the kitchen, he heard a voice. The voice said: "Be careful of her" (T 372). The Crown challenged that evidence upon a number of bases. First, Malcolm Potts gave different versions as to what the voice had said to him. Secondly, when interviewed by a number of psychiatrists between the time of his arrest and the trial, he had not disclosed hearing a voice. The suggestion first came shortly before the trial, after the psychiatrists had rejected a defence of substantial impairment by reason of mental illness.
16 In the course of his evidence, however, Mr Potts gave a plausible explanation for having previously withheld that information. He feared that, were he to disclose having heard a voice, he would be classified as a forensic patient without the possibility of a release date. I accept as probable that Mr Potts did hear a voice warning him to be careful of Ms King.
17 Mr Potts said that, when he returned from the kitchen having heard the voice, he said to Ms King that he did not wish to proceed. She then became very angry and abusive. She continually spoke with friends on her mobile phone. She said: (T 372)
"No-one fucks me around. My friends are coming. You either produce the money or we're taking your stuff."
18 During the trial there was a record of the telephone calls and, in some cases, the text messages between Emma King and her friend. At 4.26 am, she sent a text message to her friend in these terms: (Ex J[16])
"Im at ashfield. Unit 5 24 margaret st. Come to pick me up leave now and ill ring you. Love jess"
19 That was the message with the incorrect address. Mr Potts acknowledged that he had provided the incorrect address to Ms King. He said he did so to confuse her friends, who were making their way to pick her up.
20 The consequence of that confusion was to prolong the time Mr Potts and Ms King remained together. Mr Potts said that he offered her $20 and asked her to leave. At 4.31 am, according to the telephone records, Emma King sent the following text message to her friend: (Ex J[17])
"hes just fucken given me 20 and told me that he doesn't please come now"
21 The incomplete sentence was presumably that he "told me that he doesn't (have more)". At 4.32 am Emma King again telephoned her friend. She spoke to him for more than two minutes. According to her friend's evidence, she said that the journey had been a total waste of time and that he, Potts, had no money (T 102). She was plainly disappointed. She sent a further text message at 4.42 am asking where he was. Two further phone calls followed, seeking further directions, the last at 4.49 am.
22 Mr Potts gave evidence that, as they waited, she continued to abuse him. He felt that he and his possessions would be in danger once her friends arrived. On his account, having spoken to her friends, she put her phone away and walked to the bookcase. There were, on the bookcase, crossed knives. She picked up a knife (T 373). She then said words which, on the account given by Mr Potts, marked the beginning of their fight. According to his evidence, she said this: (T 373)
"Fuck you, you fat cunt, come here man I'll fucking stab ya".
23 Mr Potts, when cross examined, gave a slightly different version, and the difference may be important. He said this: (T 403/4)
"Fuck you, you fat prick, come near me I'll fucken stab ya."
24 The second version of Ms King's words, and perhaps even the first, appears to be unmistakably defensive, as though Ms King felt threatened and was endeavouring to hold Mr Potts at bay. Mr Potts was much larger than Emma King. He was 187 cm tall. She was 162 cm. He weighed 118 kg. She was less than half that weight at 55.5 kg. In that context, I accept as probable that Emma King picked up a knife. The apartment of Malcolm Potts was full of weapons. There were tomahawks, swords, knives, sticks which had been wrapped with insulation tape and stacked in the corner and other things besides. Mr Potts said that he had such weapons for his own protection (T 388/9).
25 Returning to Mr Potts' account, he said that he asked Ms King to drop the knife. When she refused, he tackled her, knocking the knife from her hand (T 373). As the knife lay on the floor, she on her stomach, she again reached for the knife. Mr Potts said that he dived on top of her. He took the knife from her. She was face down and pinned to the ground by his body weight. He then used the knife to stab her twice in the back. One wound penetrated for the length of the knife blade, which was 12 inches or 33 cm. It was hardly surprising that the jury should have rejected his assertion that he was acting in self defence.
26 At the time of the stabbing, Ms King was fully clothed (T 398). Mr Potts then dragged her body into a bedroom where he placed her upon a bed. He removed her clothing. The Crown asserted, and Mr Potts denied, that he then had sexual intercourse with the deceased.
27 A forensic pathologist attended the crime scene. A swab of the vulva was taken. It did not reveal the presence of semen. The deceased's body was then removed and taken to the morgue. The post mortem examination was performed by the same forensic pathologist the following day. A further swab of the vulva was taken. It revealed a significant quantity of semen. The semen was tested to obtain a DNA profile. The profile was compared to that of Malcolm Potts. The two profiles were the same, suggesting to a very high degree of certainty (T 329), that the semen on the deceased's vulva was that of Malcolm Potts. Moreover, the swab revealed a single profile, not the mixture of several males. What, then, was the explanation for the difference between the two swabs? Did the fact that there was no semen on the swab taken at the scene cast doubt upon the suggestion that Mr Potts had intercourse with the deceased after death? A scientist gave evidence that, following intercourse and the movement of the body, it could be expected that there would be drainage from the vagina. That, she believed, was the explanation for the significant semen on the external vulva the following day.
28 What can be said against the conclusion that Mr Potts had intercourse after death? First, in sworn evidence, Mr Potts denied intercourse. Secondly, various possible sources of contamination, whether at the scene or on post mortem, were explored. However, I am satisfied there was no contamination. Thirdly, since the deceased had HIV and I infer that Mr Potts does not, does that undermine the suggestion that he had intercourse? The Crown tendered a report from Professor Andrew Carr, the Head of the HIV, Immunology and Infectious Diseases Unit at St Vincents Hospital. Professor Carr is a Professor of Medicine at the University of New South Wales. His report makes it clear that unprotected sex with a person who is HIV positive does not necessarily transmit the disease. There is a risk, but not the certainty. Whether there is infection is dependent upon many factors. In the circumstances, I am satisfied beyond reasonable doubt that Malcolm Potts did have sexual intercourse with Emma King after her death. Clearly that is a matter of significant aggravation.
29 After her death and later the same morning, Mr Potts gathered Ms King's clothing and possessions. He placed them in plastic bags. Cleverly, he did not deposit those bags in the garbage bins of his own block of units. Rather, he carried them to a block which was physically adjacent, but in another street. The bags were later recovered by the police and tested.