Luigi Mangione’s state murder trial won’t start next month as planned — as he tries to avoid it entirely in light of his surprise guilty plea in his federal case.

Jury selection in the 28-year-old admitted killer’s Manhattan Supreme Court trial had been set to start Sept. 8.

But Justice Gregory Carro on Monday pushed Mangione’s next appearance date to Dec. 10, postponing the trial indefinitely, court records show.

Luigi Mangione’s state murder trial is getting pushed back after his surprise guilty plea in his federal case. Steven Hirsch for NY Post

Mangione matter-of-factly pleaded guilty last week to two federal stalking counts that each carry a potential life sentence.

“On the morning of Dec. 4, 2024, I shot Mr. (Brian) Thompson in Manhattan, and he died,” Mangione told the court, about the UnitedHealthcare chief executive officer he tailed and gunned down on a Midtown street.

The CEO slayer now wants his state case tossed, arguing it would constitute “double jeopardy” — being tried for the same crime twice — in light of his federal plea.

“It was a single tragic event, yet he’s being prosecuted twice for the same conduct,” Mangione’s defense attorney Karen Friedman Agnifilo said outside the courthouse after the guilty plea hearing Friday.

But Manhattan District Attorney Alvin Bragg’s office has said it will lobby to keep its case alive — at least until it learns how harsh of a sentence Mangione receives in federal court.

A courtroom sketch of Luigi Mangione pleading guilty in Manhattan Criminal Court on Aug. 14, 2026. REUTERS

Mangione’s lawyer Karen Friedman Agnifilo speaking to the media outside of court after his guilty plea. SARAH YENESEL/EPA/Shutterstock

The Post’s cover on Mangione pleading guilty in his federal case.

“While federal sentencing is pending, we are prepared to litigate the defense motions. The Manhattan DA’s Office remains committed to seeking justice for Mr. Thompson and his family,” a spokesperson said in a statement last week.

Here’s the latest on accused CEO killer Luigi Mangione’s murder trial

Carro ordered the DA’s office to file its arguments with the court by Oct. 9, with Mangione’s response due on the 30th.

Mangione, the scion of a prominent Maryland family and an Ivy League university graduate, said he targeted Thompson, a 50-year-old father of two because of a personal grudge against the health insurance industry.

Mangione admitted to shooting and killing UnitedHealthcare CEO Brian Thompson (pictured). UnitedHealth Group

A still from a surveillance video taken during the shooting of Thompson in Manhattan. Obtained by NY Post

He left bullet casings at the scene with the words “delay” and “deny” etched into them, a nod to language insurers allegedly use to dodge paying out customers’ claims, according to prosecutors.

Mangione is set to be sentenced in the federal case on Dec. 18.

He is charged with second-degree murder and illegal weapons possession in the state case.