“None of this information has been confirmed,” Gascon – the most senior prosecutor in LA Country – told a news conference.
He continued: “We are not, at this point, ready to say that we either believe or do not believe that information.
“But we’re here to tell you that we have a moral and an ethical obligation to review what is being presented to us.”
He added that his team was “not saying there was anything wrong with the original trial”.
Gascon said a review could potentially lead to resentencing or a new trial. A hearing is set for 26 November, the BBC’s US partner CBS News reports.
Gascon said his office had received an influx of calls following the release of Monsters: The Lyle and Erik Menendez Story on Netflix
The drama has caused controversy, with relatives saying the brothers had been “victimised by this grotesque shockadrama”.
The show’s creator Ryan Murphy has defended the series, and described the family’s negative reaction as “predictable at best”.
On Thursday, reality TV star Kim Kardashian voiced her support for the brothers, further fuelling renewed popular interest in the case.
“They are not monsters. They are kind, intelligent, honest men,” she said in an article for NBC News.
