'Think I got away with it': murder trial note revealed

Minutes before detectives accused her of murdering her elderly parents, Raelene Polymiadis began praying.

Her prayer, captured on a police listening device in her car, included her saying "thou shalt not kill" before adding: "they did not want to go to a nursing home", a jury was told.

The secret recordings were played on Thursday at the South Australian Supreme Court trial of Polymiadis, 65, who has pleaded not guilty to murdering her elderly parents with insulin.

Brenda and Lynton Anderson died in March 2022 and May 2023 respectively. Both were 94 at the time of their death.

The jury on Thursday were played audio from a police listening device hidden in Polymiadis' car, recording her as she drove to the Elizabeth police station to be interviewed by Major Crime detectives on June 20, 2023.

"Please, Lord, you know, yes, I have sinned. I have. Thou shall not kill," she allegedly says.

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

Mrs Anderson died from an insulin overdose at the Flinders Medical Centre.

Mr Anderson also died at Flinders Medical Centre, after he was found unconscious on his kitchen floor with a large amount of insulin in his body.

Polymiadis, a type 1 diabetic with access to insulin, had been the last family member to see each parent before they became unwell, prosecutors told the court.

A police search of her car after the interview uncovered handwritten notes that detectives allege were written by Polymiadis.

One note reads: "What they will do is wait for a few weeks, months, year (sic) to see if I 'think I got away with it' and I get cocky and slip up.

"Hang on buddy, it could be a long ride, otherwise the suspect would be arrested now."

Another note about visiting Polymiadis' father in hospital states: "just holding his hand, talking to him, but I got no response (sob)".