One night in May 1979, Pat and Bill were at a friend’s housewarming when they received a frantic phone call from their niece, Helen Moore.

Helen was babysitting the couple’s 16-month-old daughter, Susan Louise.

According to Helen, Susan had stopped breathing and had been taken to a nearby medical clinic in western Sydney.
Moore was 17 years old when she began her killing spree. (A Current Affair)
Pat and Bill rushed to the clinic.

When they arrived, they were told their bubbly little girl was dead.

“We truly believed Helen killed her,” Pat said.

The couple say they tried to tell police about their suspicions, but they were pushed aside.

“We were absolutely devastated because if they’d taken us anywhere near seriously, it could possibly have been stopped and those babies wouldn’t have died.”

For the first time in almost 50 years, Pat and Bill have chosen to speak publicly as new details come to light about one of Australia’s worst female serial killers, Helen Patricia Moore.

Moore eventually confessed to smothering Susan Louise and four other children whilst she was babysitting them.
Moore eventually confessed to smothering Susan Louise and four other children whilst she was babysitting them. (A Current Affair)
In 1980, Moore was sentenced to three life sentences and an additional 10 years for two attempted murders.

She served just 13 years and 9 months.

Moore was 17 years old when she began her killing spree.

She has always claimed her motive was the distress she felt following the death of her two-year-old brother Andrew.

Andrew was found unresponsive in his cot in March, 1979.

But a schoolyard conversation between Helen and her friend Cat Delaney has raised questions.

“She told me she had killed her little brother,” said Cat. “I was like, What? What are you talking about?”

Cat thought Helen was feeling guilty about her brother dying in her care.

“And then it wasn’t that long after, she tells me her cousin died,” said Cat. “[And that] she’s killed her cousin.”

At that point, Cat reported Helen to her deputy principal.

But nothing happened.
A Current Affair approached Helen Moore about whether she is still babysitting, which she denied. (A Current Affair)
After avoiding suspicion following the death of her cousin Susan, Moore began advertising her babysitting services on a notice board at the community centre a Claymore in Sydney’s south-west.

In the 1970s, Claymore was a newly developed public housing development where young families moved to start a new life.

Helen Moore lived at Claymore with her mother, stepfather, and four brothers.

After the death of her stepbrother Andrew and her cousin Susan Louise, Helen went on to babysit a 12-month-old boy who lived across the road.

On January 16, 1980 she attempted to smother the little boy to death.

He can’t be named for legal reasons.

The boy cried out, so an ambulance was called and he made a full recovery.

A few weeks later, Helen was babysitting a two-year-old boy, who also cannot be named.

Moore went into his room and put her hands over his mouth and nose.

When she thought he was dead, she went back to the lounge room to watch television.

The little boy began crying and was bleeding from his mouth and nose.

He was taken to hospital and survived, but was left with permanent brain damage.

“She’s a very sick-minded woman,” said Darren Hay, brother of Rachel Hay who was murdered by Helen Moore.

Darren was nine-years-old when Helen Moore babysat him and his three sisters for the first time on February 23, 1980.
After avoiding suspicion following the death of her cousin Susan, Moore began advertising her babysitting services on a notice board at the community centre a Claymore in Sydney’s south-west. (A Current Affair)
He says his 10-year-old sister Sonya witnessed Helen smothering Rachel to death.

“[She was] somewhere in the doorway [to Rachel’s room] and [saw] Helen do something,” he said.

“And the cold-hearted, evil person [Helen] was, she turned around and said to my sister [and said], ‘You’ve seen nothing. If you tell anybody what you’ve seen, your brother and sister will be next’.”

When Darren’s parents returned home, Sonya and Moore told them Rachel was sick.

His mother raced upstairs where she found Rachel dead in her cot.

“I remember the screams, the screams were just horrific,” Darren said.

“My mother fell to the ground.

“At the time, it was believed Rachel had died of SIDS.

Moore attended the funeral where Darren says she placed a flower on Rachel’s coffin.

“We all know everyone has a message to send when you do that to a loved one, so what was in that twisted mind when she done that?”

Darren’s family learnt the truth weeks later, when Moore killed her final victim, Peter.

Peter Moore was another stepbrother of Helen.

The seven-year-old was at home with Helen on the morning of March 31, 1980, when she attacked and killed him whilst he was watching television.

When an ambulance officer arrived and saw scratches on Peter’s face, Helen’s act was up.

She was hauled in by police and confessed to her crimes.

Helen was released on parole in 1993 at the age of 31.

She later married and changed her name to Helen Anderson.

When she moved to the NSW Central Coast in 2013, she began babysitting her neighbour’s kids.

“I thought she was lovely, nice,” said Aaliyah, who was 10 years old when she met Helen.

“I spent every weekend there, sometimes four times a week, [I’d] go over there, spend the night … even during school.”

Aaliyah says Helen had an obsession with watching the news and followed true crime pages on Facebook.

“It kind of is like she was watching out to make sure no one was posting anything, and keeping an eye out to make sure no one found out her identity.”

It was around this time Helen’s brother Craig discovered she was not on the NSW Child Protection Register.

The register is a private, police-managed database used to track individuals convicted of serious child sexual or violent offences, including murder.

By law, anyone convicted of these crimes is automatically placed on the register.

Helen Moore was not.

“It’s just a joke,” Craig said.

“It’s not preventing harm to the child, it’s helping them catch somebody after another child is broken.”

Thanks to Craig, Helen is now on the list.

A Current Affair approached Helen Moore about whether she is still babysitting, which she denied.

At 63, Helen currently lives less than 100 metres from a day care centre.

Watch the full video in the player above.