SA triple murder trial before judge alone

A man accused of killing his partner and her two children is to be tried by a judge alone.

Steven Graham Peet pleaded not guilty on Monday to murdering Adeline Yvette Rigney-Wilson, 29, and her children, aged five and six, at a property north of Adelaide in May 2016.

Defence counsel Bill Boucaut told the Supreme Court the 31-year-old would elect to be tried by a judge sitting without a jury.

The case will now proceed to a directions hearing on May 19.

The bodies of Ms Rigney-Wilson and her children were found at a house at Hillier on May 30 last year.

Details of how they were killed have not been revealed.

After the deaths, Families SA confirmed they had been in "active contact" with Ms Rigney-Wilson and her children.