Luigi Mangione’s latest New York court hearing was pushed back to Wednesday — after prosecutors failed to contact the accused killer’s jail in time to bring him to court.

“It’s on us,” Assistant District Attorney Joel Seidemann said Tuesday morning, after Mangione was missing from Manhattan Supreme Court more than a half-hour after the pre-trial conference was set to start.

“We got the writ signed but we failed to serve it,” Seidemann further explained, referring to a court order meant to be sent to the accused assassin’s lockup, the Metropolitan Detention Center in Brooklyn.

“That’s unfortunate,” replied Manhattan Supreme Court Justice Gregory Carro.

Carro adjourned the case until Wednesday morning.

“These things happen … He’s human,” Mangione’s attorney Karen Friedman Agnifilo said when asked about the Manhattan DA office’s flub on her way out of the courthouse.

The 28-year-old Mangione is now due in court Wednesday ahead of a September 8 trial where a jury will decide whether to convict him of executing UnitedHealthcare CEO Brian Thompson. 

Wednesday’s proceeding will be held in full view of the public, in contrast to a mysterious “sealed” hearing that Justice  Carro ordered earlier this month at the request of Mangione’s defense team.

It followed Carro last month handing prosecutors a key legal win by allowing jurors to see the alleged murder weapon — a 3D-printed pistol — and the “manifesto” found inside Mangione’s backpack when he was arrested in Altoona, PA., following a five-day manhunt.

Mangione has pleaded not guilty in parallel state and federal cases to charges of fatally shooting Thompson, a 50-year-old father-of-two, from close range on a Midtown sidewalk in December 2024.

But his lawyers have been stalling on revealing if they’ll use a psychiatric defense at his trial — a legal gambit that, if successful, could reduce his time in prison or result in him being institutionalized.

Carro did not explain why he blocked the public from accessing the June 3 pretrial hearing, but a New York State court system spokesperson hinted that a pending ruling in the case could shed light on the secrecy.

The judge also refused to let journalists challenge his decision to keep the hearing hush hush — despite state legal precedent stating that he must provide a “specific” reason for doing so.

Dozens of Mangione’s warped fans — who have praised him for highlighting the ills of the US healthcare system despite allegations that he executed the head of a major company in the process — have supported him at his past appearances.

Three of his most bloodthirsty cheerleaders, who dubbed themselves the “Mangionistas,” were even granted press passes by City Hall, in a baffling move that has drawn widespread condemnation.

Lena Weissbrot, a 32-year-old self-described Mangione fan with a press pass, was asked Tuesday where her independent “press” work could be read. Weissbrot replied, “At suck my c–k dot com.”

Mangione faces up to life in prison if convicted in either his state or federal case.

The clean-cut scion of a wealthy Maryland family plotted to “rebel against the deadly, greed fueled health insurance cartel” by targeting the head of “a company that literally extracts human life force for money,” he wrote in notebook entries cited in court papers.