The complainant, [M], born 19 January 1973, has an acquired brain injury, as a result of contracting encephalitis as an infant. The accused, born 28 September 1952, was, at the time of the commission of these offences, in an intimate personal relationship with the complainant's mother, [H], now deceased.
On 16 May 2013, the complainant was assessed by Dr Phil Watts, associate professor in clinical psychology, as being an incapable person, under section 330 of the Criminal Code.
Between 31 December 1993 and 17 June 1997, the complainant was living with her mother at [a Perth suburb], with her mother being her primary carer. The accused then lived at [a Perth suburb] but spent the majority of his time in company with the complainant and her family.
On six separate occasions between those dates, the accused engaged in penile vaginal intercourse with the complainant at his home address. The accused ought to have known, at that time, that the complainant was so mentally impaired as to be incapable of guarding herself against sexual exploitation.
This resulted in the complainant falling pregnant and giving birth to a child, [K], on 16 June 1997. The complainant's mother did not report the matter to the police and raised the child, until [the complainant's mother] died, in October 2002.
Shortly after that, the accused sued for custody of the child, which was granted in June 2003. In supporting evidence, the accused swore by affidavit that [he had] had penile vaginal intercourse with the complainant six times prior to conception of the child.
A police investigation into this matter commenced in February 2013, after the complainant made allegations concerning the conduct of the accused at the complainant's home during a recent visit to those premises by [K] and the accused (ts 246 - 247).