George Gascón, the Los Angeles district attorney, said on Thursday that his office was reviewing a decades-old case involving the brothers Lyle and Erik Menendez, who killed their parents in their Beverly Hills home and were sentenced to life in prison.

The case in the 1990s was one of the first to draw a daily national audience to a televised criminal trial. By their own testimony, the two young men marched into the den of the family’s mansion one evening with shotguns and fired more than a dozen rounds at their mother and father while the couple sat on the couch.

Prosecutors presented the brothers as greedy, coldblooded killers, interested in having unfettered access to their parents’ assets, which were valued at about $14 million. Defense lawyers for the brothers argued that they had been sexually molested for years by their father, and had killed out of fear.

Mr. Gascón wouldn’t indicate which way he was leaning, but his remarks indicated that the sex abuse claims are among the aspects his office was reviewing. He said his office was divided over whether the brothers should remain in prison for the rest of their lives.

“We have a moral and ethical obligation to review what is being presented to us,” he said.

Mr. Gascón’s remarks come in the homestretch of his re-election bid as interest in the Menendez case has intensified after the release of a new Netflix drama about the case. The series, “Monsters: The Lyle and Erik Menendez Story,” has been assailed by Erik Menendez and many other members of the Menendez family as grotesque and riddled with falsehoods.

Ryan Murphy, one of the series’s creators, has defended his work in interviews. He told The Hollywood Reporter that there was “room for all points of view” and argued that the brothers should be grateful to him for bringing more attention to the case.