'Thou shalt not kill, I have sinned': Jury hears alleged parent murder confession

Raelene Polymiadis is standing trial for allegedly murdering both her parents in separate incidents using insulin. (ABC News: Dean Faulkner)

Police allegedly captured accused murderer Raelene Polymiadis on listening devices confessing to killing her mother and father.

The 65-year-old is standing trial after pleading not guilty to murdering Brenda and Lynton Anderson 14 months apart.

Accused murderer Raelene Polymiadis was allegedly captured on police listening devices confessing to killing her elderly parents, a court has heard.

Ms Polymiadis, 65, of Craigmore, is standing trial in South Australia's Supreme Court, accused of murdering her parents 14 months apart in 2022 and 2023.

Brenda and Lynton Anderson were both aged 94 at the time of their deaths.

The 14-person jury was previously told Ms Polymiadis, who is a type 1 diabetic, allegedly injected and killed her parents with fatal doses of insulin.

Brenda and Lynton Anderson, both aged 94, died about 14 months apart. (Supplied: Nine News)

On Monday, prosecutor Michael Foundas told the jury that listening devices captured Ms Polymiadis making alleged confessions after her parents died, in June 2023.

"On the prosecution case, that listening device captured the accused, Ms Polymiadis, alone in her car praying to God on two separate occasions," he said.

"In the course of those prayers, on each of those two occasions, on the prosecution case, she confesses to God to killing both of her parents."

Mr Foundas told the jury Ms Polymiadis said: "Please Lord you know, yes I have sinned, I have, thou shalt not kill, I have sinned".

"I have sinned twice, I have sinned twice in my life, and I hate it, but I also know, I also know, I also know with your blessing Lord that they did not want to go to a nursing home, that was their wish," he recounted to the jury.

Prosecutor Michael Foundas opened the trial on Monday. (ABC News: Dean Faulkner)

Mr Foundas said one of the alleged confessions was captured on June 20, 2023, while Ms Polymiadis was on her way to an interview with a Major Crime detective from SA Police.

"What is captured on the listening device in the car on that day, in addition to her confession to God, is her praying to God for strength to show emotion where I need and to stop me with that tongue from running off at the mouth," he told the jury.

Mr Foundas said a linguistic expert would give evidence about what Ms Polymiadis said.

Raelene Polymiadis was allegedly captured on a listening device saying she had "sinned twice". (ABC News: Eva Blandis)

He also told the jury that notes found in