A Los Angeles judge has postponed a resentencing hearing for Lyle and Erik Menendez, the brothers serving a life sentence for killing their parents in 1989.
A motions hearing has been scheduled for 9 May to hear arguments on the admissibility of a state parole board risk-assessment report.
The resentencing hearing, which was opposed by Los Angeles County District Attorney Nathan Hochman, could have made the brothers eligible for parole and possibly have resulted in their release after 35 years in prison.
The brothers' attorney Mark Geragos told reporters outside court that he plans to file a motion to remove Hochman from the case.
"Based on the analysis we have done, based on recusal motions which I have filed in the last 25 years and won in this county, this is about as righteous a recusal motion of a DA that I've ever had," Mr Geragos said.
The recusal motion will also be discussed on 9 May.
The Menendez brothers were convicted in 1996 of first-degree murder and sentenced to life in prison without the possibility of parole for shooting their parents, Jose and Kitty Menendez, at their Beverly Hills home on 20 August 1989.
The case captivated the US in the 1990s because of the brothers' wealth and privilege as sons of a record company and entertainment industry executive.
Lyle was 21 and Erik was 18-years-old at the time of the murders.
During their trials in the 1990s, prosecutors said the men killed Jose and Kitty Menendez in their luxury home to get their hands on a $14 million fortune.
They initially blamed the deaths on a Mafia hit, the first of five disparate explanations they offered.
But at trial they claimed they had acted in self-defence, striking first before their abusive and controlling father could kill them, after years of emotional and sexual abuse.
The brothers' original trials were huge events, and the case saw a surge of renewed interest last year with the release of the Netflix hit 'Monsters: The Lyle and Erik Menendez Story'.
Read more: US prosecutor recommends resentencing Menendez brothers
