South Australia man, 46, to be sentenced for killing son and his girlfriend, both 19

A ‘monster’ who shot his son and his son’s girlfriend, pausing to reload between the killings as the young woman frantically called for help, is about to be sentenced for his murderous acts.

Pawel Klosowski is listed to face the South Australian Supreme Court for sentencing on Thursday, when a non-parole period or minimum term will be set alongside his mandatory head sentence of life behind bars.

In recent submissions, the 46-year-old admitted he could not explain his actions at his rural property in the state’s southeast in August last year.

He had earlier pleaded guilty to the murders of his son Lukasz Klosowski and Chelsea Ireland, both aged 19, after an argument fuelled by alcohol and anger.

Chelsea Ireland and Lukasz Kłosowski, both 19, were shot dead at a property in southeast South Australia

Before she was gunned down in a double murder at a rural farm in southeast South Australia, Chelsea Ireland lived her life putting others before herself

In a short apology read to the court he said he thought about what he had done every day.

‘I acted like a monster. The world would be a better place if I had shot myself instead,’ he said.

But prosecutor Kos Lesses said the apology was ‘too little, too late’.

Mr Lesses said the shootings followed a row between Klosowski and his son after the teenager had indicated his intention to move out of his mother’s house.

‘The offending came about due to the insulting of the defendant’s pride,’ the prosecutor said.

Pawel Klosowski (pictured) is listed to face the South Australian Supreme Court for sentencing on Thursday

‘And it was fuelled by the combination of two fatal causes, anger and alcohol.’

The court heard that Lukasz was shot first and then Klosowski had reloaded his gun before firing once at Ms Ireland through the locked bathroom door where she had hidden and called triple zero.

A second shot, delivered at close range, had killed her.

Because of his early guilty pleas, Klosowski is entitled to up to a 40 per cent discount on his non-parole period but Mr Lesses asked for any reduction to be significantly curtailed.

Defence counsel Nick Vadasz told the court that while Klosowski could not explain his actions on the night he accepted that his intention was to kill.

‘The prisoner accepts the horror of his behaviour,’ Mr Vadasz said.