Medical experts concluded Sainey Marong did not have a defence of insanity before standing trial for the alleged murder of Renee Duckmanton.
During a dramatic day in the High Court at Christchurch yesterday, 33-year-old Gambian-born butcher Marong admitted strangling the Christchurch sex worker in May 2016 and setting her body on fire.
He claimed he was insane at the time, suffering mental impairment and delusional, psychotic thoughts which began after voluntarily stopping his insulin medication early in 2016.
Marong spent the day on the witness stand to repeatedly explain that he was “disconnected from reality” at the time he killed Ms Duckmanton, and that from May 6-17, he was poisoned by kidney failure that resulted in urine “travelling in my brain”.
Cruising past prostitutes and paying them for sex were the only ways a “hypersexual” Marong could calm his delusional thoughts, the jury heard.
Crown prosecutor Pip Currie asked Marong under cross-examination if he was telling the court he was insane at the time.
“Definitely,” he replied.
Mr Currie said forensic clinical psychiatrists who completed reports on Marong concluded that he did not meet the criteria for a defence of insanity.
Medical experts found Marong to exaggerate symptoms, become histrionic, and display significant narcissistic traits, the court heard.
One psychiatrist concluded that Marong had a “considerable sense of entitlement and grandiosity”, along with a high propensity to deception and manipulation.
Marong denied telling one that he found sex workers to be “dirty, immoral and inferior”.
He also admitted under cross-examination lying to psychiatrists but claimed he was deluded at the time.
Marong, whose internet history in the days before the killing showed searches for necrophilia, denied having sex with her dead body.
The trial, before Justice Cameron Mander, is continuing today.