After a suppressed week-long trial in the High Court at Auckland, he was convicted of raping a woman, a then 9-year-old girl, and the attempted rape of a woman.
It is Wilson's third victim, whom he attacked in Auckland during December 1976, who says police officers mistreated her and failed to take her allegations seriously.
Her night of horror began after she responded to a classified newspaper ad Wilson had placed.
The two decided to meet, but something wasn't right.
"I knew I had to do something to get away from his house."
She left in a taxi but the driver insisted she report the monstrous man.
"I'm taking you straight to the police station not home," the cabbie said.
She arrived at the Onehunga police station and said officers were "quite sympathetic" before she was transferred to the Auckland central police station to be interviewed.
While there, she says, police "treated me like sh*t".
"How was it? Did you enjoy it? What was it like? Was it great?" She said police joked and asked her.
Under cross-examination he said he found the suggestion the clothes were thrown on the ground "really inappropriate".
"I personally handed those [to her], and I can assure you that's not in my DNA to throw things at a person," he said.
When asked about the allegations of police misconduct at the station, the retired cop said allegations of rape are "taken probably more seriously now" than in the 1970s.
Wilson's victim made another complaint to police in 1996 when Wilson infamously went to trial, but charges were only laid after she was re-interviewed again in 2016.
When police re-investigated Wilson two years ago they were unable to find any paperwork of the woman's complaint from 1976.
One of Wilson's other victims, who was raped after Wilson hid in kitchen cupboard while police searched her home, also said she approached detectives in 1996.
"I knew it would help me to tell my story instead of keeping it all bottled up inside," the woman said.
"I was told [by police] Murray Wilson couldn't be charged at that time [for the crimes against me] because he was already on charges."
Wilson was sentenced in 1996 to 21 years' imprisonment for sex and violence offences against women and girls, as well as charges of stupefying and bestiality.
In 2012, he was subjected to an extended supervision order and released with the most stringent conditions ever imposed on a New Zealander, including being paroled to a two-bedroom house which had been moved onto the Whanganui Prison grounds.
In a statement, Detective Inspector Scott Beard told the Herald it would be inappropriate for police to comment on the woman's evidence about officer misconduct before Wilson's sentencing next month.
"Getting justice for the victims in this matter is our priority and we do not want to do anything to jeopardise that," he said.