A recent wrongful-death lawsuit filed against Robert Durst for the suspected murder of his wife Kathie is decades past the statute of limitations and should be tossed, the real estate scion’s lawyer argued in Manhattan court Thursday.

“In 1982, Kathleen Durst disappeared. The plaintiffs had two years to bring that claim,” Robert Durst’s lawyer, Joshua Siegel, said as he asked a judge to dismiss a March lawsuit filed by Kathie’s sister, Carol Bamonte.

Instead, they waited till they saw the HBO show “The Jinx” — in which Durst was caught muttering to himself, “What the hell did I do? Killed them all, of course” — and “had an ‘ah ha!’ moment,” Siegel said.

“Robert Durst has never been convicted of, much less arrested or charged in connection with, the murder of Kathleen Durst,” his lawyer said.

The 76-year-old oddball heir to the Durst Organization is in custody in Los Angeles and faces a January trial for allegedly murdering pal Susan Berman in 2000 to stop her from telling cops about his role in Kathie’s disappearance. Neither he nor Bamonte were in court Thursday.

Bamonte’s lawyer, Robert Abrams, fired back that Kathie’s family shouldn’t be penalized simply because Durst “deceived everybody.

“Durst covered up this horrific crime. He’s a serial murderer who shouldn’t be rewarded for covering up a crime long enough so that he can defeat the statute of limitations,” Abrams said.

As for Siegel, he also noted that Bamonte and her other sisters already filed a $100 million lawsuit against Durst four years ago in Nassau County, arguing that the newer suit has very similar allegations. Siegel said that if the judge didn’t throw out the suit, at the very least, he should combine it with the Nassau case.

Manhattan Supreme Court Justice Paul Goetz did not say when he would issue a decision.

Durst’s lawyers have said that the makers of “The Jinx” cherry-picked the old man’s ramblings during editing “in a way that’s very damning.”