Tony Lloyd, the Greater Manchester Police and Crime Commissioner, says more help should have been offered to Tracy Shelvey.
Ms Shelvey died after falling from a car park roof in Rochdale.
"You've got to believe that the trauma of going through the trial process twice, of all she went through, whatever the validity of the verdict of the court, was an enormous ordeal and we've got to help people like Tracy better than we did do."
A "root and branch review" of how victims and witnesses in trials are treated is "urgently needed" after the death of Tracy Shelvey, Greater Manchester's Police and Crime Commissioner has said.
The 41-year-old fell from the roof of a car park on Monday morning just a few days after a man was cleared of raping her.
Tony Lloyd said lessons had to be learned from the incident:
This can't go on - a root and branch review of how victims and witnesses are treated is urgently needed.
A chain of vulnerability exists from the moment someone reports an incident to police, and it can break at any point.
We need to ensure that victims and witnesses are surrounded by support from when they report to police, throughout the investigation, the court process and - critically - after trial is over, whether the accused is found guilty or innocent.
And we all need to work much better together to ensure that victims and witnesses get the support they need, when they need it.
Greater Manchester Police said the matter had been referred to the Independent Police Complaints Commission and a full investigation will be launched to establish the circumstances surrounding Ms Shelvey's death.
The family of a woman who died after falling from a car park roof in Rochdale have paid tribute to her saying they were "so proud" that she gave evidence in court.
Tracy Shelvey had "distressed" after a defendant in a rape trial in which she was the complainant was acquitted.
Tracy Shelvey fell to her death from the roof of a car park after a defendant in a rape trial in which she was the complainant was acquitted.
“Tracy was a kind and caring person and comes from a loving family who she kept in regular contact with," the family statement read.
“She had a warm heart and was a loyal friend and will be deeply missed by all.
“We are so proud of Tracy for standing up in court on the two trials.
“She was a strong person with a lot of pride. We also want to thank Tracy’s friends for their support at this time.”
A Ministry of Justice spokesperson has offered the department's sympathies to the family of a woman who fell to her death from a car park roof just days after a man accused of raping her was acquitted following a trial.
She added: "We know that going to court can be intimidating and sometimes distressing and want to ensure the entire system is doing everything it can to support people through this process, and ensure justice is done."
She went on: "There are already numerous special measures available to help vulnerable witnesses give evidence - such as using screens or video link - but we know sometimes more could be done.
"That is why we are trialling an important new way of sparing vulnerable witnesses the trauma of appearing in court through pre-trial cross examination."We have also overhauled the Victims' Code so people know what to expect and who to demand help from every step of the way."
A woman who died following a fall from the roof of a car park in Rochdale earlier today, had been the complainant in a rape case, it has emerged.
The man accused of raping her was acquitted following a trial last Friday.
An investigation has been launched to establish the circumstances surrounding her death.
Greater Manchester Police said the matter has been referred to the Independent Police Complaints Commission.
I would firstly like to offer my condolences to the family of the woman who has sadly died. Our thoughts are with the family at what is clearly a traumatic time for them and we will be offering them as much support and welfare as they need over the coming days and weeks.
The woman had been a complainant in a case that recently concluded at court, and throughout that process specially-trained officers from Greater Manchester Police had been providing her with regular support and advice.
This is a terribly sad end to what has been a long and difficult case.
A full investigation will be carried out to establish the circumstances leading up to this woman's death and it is important, especially for the woman's family, that we do not speculate about what may have happened until all the facts are known.
A woman who has died after falling off the roof of a shopping centre car park had been "distressed" after a defendant in a court case in which she was the complainant was acquitted.
Greater Manchester Police said two specially-trained officers had been in regular contact with the woman and made a personal visit to her home to inform her of the verdict last Friday.
A statement said she had been "angry and upset" at the news and was offered support. Later that evening, she rang police in a "distressed state" and officers and ambulance staff attended her home.
A subsequent referral to partner agencies to help support the woman was made.
The matter has been referred to the Independent Police Complaints Commission and a full investigation will be launched to establish the circumstances surrounding her death, police said.
A woman has fallen to her death from a Rochdale shopping centre car park roof just days after a defendant had been acquitted in a trial in which she had been the complainant.
Police were called today to the Wheatsheaf Shopping Centre after reports of a woman on the roof at 10.10am, but despite attempts to help her, she was later seen to fall.
She was taken to hospital but died as a result of her injuries.
The trial had concluded on Friday.
Greater Manchester Police has launched an investigation to establish the circumstances surrounding her death.
The matter has also been referred to the Independent Police Complaints Commission.
A Department for Education spokesperson said:
This Serious Case Review, which has been heavily redacted, does not meet the standards of transparency and sharp analysis which we now expect and which best allows lessons to be learnt.
We understand there are particular legal constraints which have resulted in the heavy redactions.
We have consequently agreed with Rochdale LSCB that we will commission, early in the New Year, an examination of the evidence assembled by the SCR to explore whether an un-redacted document can be put into the public domain with a sharp and coherent analysis of what happened in this complex case and why.
Class snobbery by police against young girls from council estates allowed the Asian sex grooming gangs to flourish, the local MP has said.
Simon Danczuk, the Labour MP for Rochdale, said officers' attitudes to victims' backgrounds was one of a catalogue of failings by Greater Manchester Police and other agencies in their handling of the scandal, highlighted in the Serious Case Review published today.
This highlights exactly the concern I raised earlier this year when I said there needed to be a change of culture within GMP in tackling child abuse.
I have also said judgments were made against young people on council estates because of their background and class, and this report confirms this.
The approach has been completely wrong. Senior police officers keep talking about deploying more resources, but they're sending out untrained officers who cannot win the trust of victims.
We need better leadership on this issue.It worries me that the report shows there is evidence of a focus on performance targets, which has meant that child sexual exploitation is not a police priority.
This crime has done a huge amount of damage to our town and the police have to give it more attention.