(AP) — A murder trial has been delayed for a 24-year-old Guide Rock man accused of helping his mother kill the mother of her boyfriend.

The attorney for Andrew Casterline had asked the judge for the delay. Last week, the judge complied with the request, setting a new trial start date of Sept. 8. The original date was May 27.

Casterline is accused of stabbing 68-year-old Virginia Barone on Oct. 4 at her home in Guide Rock. His mother, 41-year-old Shelley Casterline, in March pleaded guilty to a reduced murder charge. She’s scheduled to be sentenced on June 10.

Investigators have said Shelley Casterline acknowledged she’d killed Barone after the older woman made comments that enraged her.