The discovery of Corryn Rayney’s body, buried in a city park in 2007, sparked what would become the biggest murder investigation in West Australian history.

Members of the public and police were united in bringing the young mother-of-two, devoted wife and Supreme Court registrar’s killer to justice.

Then came a shock – Corryn’s husband, high-profile barrister Lloyd Rayney, was named as the “prime and only” suspect. Everyone thought he did it.

The discovery of Corryn Rayney’s body, buried in a city park in 2007, sparked what would become the biggest murder investigation in West Australian history. (60 Minutes)

‘Presumed Guilty’ airs tonight on Channel 9 after The Block. For more on 60 Minutes head to the official website .

Tonight in a major 60 Minutes investigation, Mr Rayney speaks out on the criminal case brought against him.

In a rare, unprecedented interview with reporter Tara Brown, Mr Rayney has chosen to break his ongoing silence in a bid for a new investigation to find who really murdered his wife.

Backed up by experts who claim the police acted in an “appalling, criminal” manner, Mr Rayney tells Brown he believes he was targeted by investigators on a blind pursuit to destroy his reputation and career.

Corryn Rayney, 44, was last seen on August 7, 2007, after leaving a boot-scooting dance class at 9.30pm.

In a rare, unprecedented interview with reporter Tara Brown, Mr Rayney has chosen to break his ongoing silence in a bid for a new investigation to find who really murdered his wife. (60 Minutes)

She was due home shortly after.

As the night went on, Mr Rayney and the couple’s two daughters went to sleep assuming Mrs Rayney was out with friends.

The next morning when there was still no sign of her, they all thought she had gone into work early.

“There was no reason to believe anything had happened,” Mr Rayney tells Brown.

But when he received a call from his wife’s office, saying she hadn’t arrived for work, he was immediately concerned.

“I knew straight away that something was wrong,” Mr Rayney said.

Members of the public and police were united in bringing the young mother of two, devoted wife and Supreme Court Registrar’s killer to justice. (60 Minutes)

“Corryn was very conscientious, loved her job. For her not to go to work, something was wrong.”

Mr Rayney – who has always maintained his innocence – tells Brown he instantly did all he could to help police find his missing wife, helping them access her Supreme Court emails and allowing them access to their family home.

After eight torturous days, police made a gruesome discovery - Corryn’s body was found buried in Perth’s iconic Kings Park, just 50 metres from the road.

Mr Rayney and his daughters were devastated. Adding to the horror, police had decided Mr Rayney was their main suspect.

Their suspicion arose from the discovery that while the Rayneys were living under the same roof, they were in the midst of a bitter separation.

On the very night Mrs Rayney was murdered, the pair were supposed to meet to finalise thorny details of finances and custody of their two daughters.

Then came a shock – Corryn’s husband, high-profile barrister Lloyd Rayney, was named as the “prime and only” suspect. Everyone thought he did it. (60 Minutes)

What followed was a heavily publicised police investigation which focused the majority of its time, resources and commentary on Mr Rayney.

A month after Mrs Rayney’s disappearance, the head of the investigation, Senior Sergeant Jack Lee called a press conference to claim a breakthrough in the murder case, naming Mr Rayney as the “prime and only suspect”.

Three years later, on December 8, 2010, police pulled Mr Rayney over in busy downtown Perth to arrest and charge him with his wife’s murder. It was their most public display of force yet.

“I had worked by that stage – more than 20 years as a hard-working lawyer to build a career,” Mr Rayney tells Brown.

“It took less than 20 minutes to destroy all that.”

Tonight in a major 60 Minutes investigation, Lloyd Rayney speaks out on the criminal case brought against him. (60 Minutes)

Five long years after Corryn Rayney’s murder, the “trial of the decade” against Lloyd Rayney took place.

What was revealed to the court was the full extent of police bias against Mr Rayney and the lengths they went to prove he was the murderer, despite having some compelling evidence he wasn’t.

Reporter Tara Brown is tonight joined by several experts who not only reveal the flaws in the police case, but the evidence that proves Lloyd Rayney could not and did not murder his wife.

Audiences will also see the other possible suspects who were all but ignored by police determined to prove Mr Rayney’s guilt.

Brown will also ask Mr Rayney the question the public has always wanted answered.

“What do you believe happened to Corryn?”

“There was no reason to believe anything had happened,” Mr Rayney tells Brown. (60 Minutes)

Despite being found innocent in court three times – at his murder trial, at the prosecution’s appeal, and in a defamation case which resulted in a record payout against the West Australian police – Lloyd Rayney is financially ruined, his reputation destroyed.