The mother of a South Australian man jailed for killing his partner and burying her body under a concrete slab will return to court after admitting to helping him conceal the crime.
Margaret Archer pleaded guilty in the District Court on Monday to one count of assisting an offender.
She is due to appear again on Friday for sentencing submissions, when a number of victim impact statements are expected to be read to the court.
It was previously alleged she helped her son Neil Archer hide his crime and avoid arrest after he killed 20-year-old Jody Meyers in August 2015.
He is serving a head sentence of life in prison with a 22-year non-parole period.
The 32-year-old strangled Ms Meyers after a heated argument following a family barbecue, sparked by his concerns her family was trying to break them up.
He took her body to his parents' home near Mannum, east of Adelaide, and buried it under the floor of the toolshed before returning the next day to cover the grave with fresh concrete.