Killer babysitter under investigation again as police probe potential sixth victim

Helen Patricia Moore is the killer babysitter convicted of smothering three children to death and attempting to kill two others.

Her crimes were committed almost 50 years ago, but after an A Current Affair investigation, NSW Police is now reopening the case of a potential sixth victim.

In March 1979, Moore was minding her siblings at their home in Claymore in Sydney's south-west.

Her stepbrother Andrew was asleep in his cot when Moore began screaming.

"We raced into the bedroom, she ran out to the neighbour's house," Craig Moorley, Helen's brother, told A Current Affair.

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"I picked him up and put him on Helen's bed and tried to give him mouth-to-mouth. I was only 12 years old at the time, I didn't know what I was doing. I couldn't bring him back."

Andrew is the potential sixth victim.

Moorley has remained adamant his sister Moore was responsible for Andrew's death.

"I was originally charged with it, charges were dropped because of insufficient evidence," Moore told A Current Affair.

Helen's former school friend, Cat Delaney, told A Current Affair that Moore had confessed to Andrew's murder.

"She just looked me straight in the face and just told me matter-of-factly, 'I killed my little brother'," Delaney said.

After Andrew's death, Moore went on to babysit other children - including her cousin, Susan Louise.

Susan's parents Pat and Bill recalled the night Susan died.

"We were panicking because there was nothing wrong with her when we left," Pat said.

"She was perfectly healthy and asleep. We truly believed Helen had killed her."

At the time, police ruled Susan's cause of death as suffocation on her own vomit.

Moore continued babysitting, where she attempted to smother two male toddlers on separate babysitting jobs. They survived, but one boy was left with permanent physical injuries.

The 17-year-old went on to kill her next victim, Rachel Hay.

"I remember the screams, the scream were just horrific," Darren Hay, Rachel's older brother who was also being babysat by Moore, said.

"I remember Helen saying she was going to put Rachel to bed, and my older sister Sonya was in the doorway," Hay said.

"(Sonya saw) Helen do something (to Rachel) and the cold-hearted, evil person she was, (she) turned around and said to my sister...'If you say anything, your brother and sister will be next.'"

At the time, Rachel's cause of death was ruled as SIDS - sudden infant death syndrome or "cot death".

A month later, Moore killed her fifth victim, her seven-year-old brother Peter. The truth of her crimes unravelled.

Moore was found guilty of smothering Susan, Rachel and Peter and attempting to kill the other two boys.

She was sentenced to life in prison and served just 13 years and months.

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Moorley's fight to expose his sister has led police to reopen the case of Andrew's death.

"I'm hoping she's charged with additional murder,"  Moorley said. 

"I believe this can protect the kids."

Former NSW detective Peter Moroney said: "Without being critical of the original police at the time, they may have got it wrong.

"There's got to be something in it for them, in a sense, they know it's solvable and they are going to have that last-ditch effort at doing it."

Moroney says police will be relying heavily on statements from both original and new witnesses - with the potential for new evidence to emerge.

"I would like to see at least the matter put before the courts if there is that sufficient evidence."