The man federal prosecutors say deliberately set the fire that became the catastrophic Palisades blaze was fixated on accused UnitedHealthcare CEO killer Luigi Mangione, ranted to Uber passengers about capitalism and vigilantism, and told investigators that arson in Pacific Palisades would stem from resentment of the wealthy, according to a trial memorandum filed by prosecutors.
Jonathan Rinderknecht, 29, faces federal charges of destruction of property by means of fire, arson affecting property used in interstate commerce, and timber set afire. He has pleaded not guilty. But the portrait prosecutors paint in their new memorandum is one of a man seething at the world, and channeling that rage into an act that, if the government's case holds, helped set the stage for a disaster that claimed twelve lives.
The Palisades Fire was one of the deadliest in California history. Prosecutors allege Rinderknecht sparked what became known as the Lachman Fire on New Year's Day 2025 after parking near the Skull Rock trailhead. That fire was suppressed, but heavy winds later reignited underground embers buried in dense root systems, and the Palisades Fire erupted on January 7. Together with the Eaton Fire, the blazes killed 31 people, burned for weeks, and caused damage estimated in the hundreds of billions of dollars.
The trial memorandum lays out a detailed timeline of Rinderknecht's alleged state of mind. Federal prosecutors said he searched "free LuigiMangione," "lets take down all the billionaires," and "reddit lets kill all the billionaires" on December 12 and 13, 2024, just over a week after Mangione allegedly assassinated UnitedHealthcare CEO Brian Thompson in New York City on December 4.
Prosecutors wrote in the memorandum:
"In the months leading up to the fire, he had become increasingly angry with his life and society at large. For example, in the weeks and hours leading up to the fire, defendant fixated on Luigi Mangione, who allegedly murdered the UnitedHealthcare CEO in New York City on December 4, 2024."
The government's filing goes further. On December 30, 2024, a former co-worker Rinderknecht had briefly dated in March 2024 asked him for space. Prosecutors said he responded by leaving her two voicemails they described as "manic" and by entering prompts into ChatGPT "expressing his extreme displeasure of her treatment of him."
By New Year's Eve, prosecutors allege, his anger had become impossible to contain. Federal authorities said Rinderknecht was working as an Uber driver in Los Angeles that night and into New Year's Day. The memorandum describes him in blunt terms:
"Many of defendant's Uber passengers on December 31, 2024 and January 1, 2025, described defendant as angry, intense, driving erratically, and ranting about being 'p***ed off at the world' and Luigi Mangione, capitalism, and vigilantism."
Two passengers told federal authorities that Rinderknecht appeared agitated and angry after dropping off a passenger in Pacific Palisades. Prosecutors also said he "exhibited extreme anger, indignation, and frustration about being unable to find companionship on New Year's Eve."
The intersection of personal grievance and ideological fixation is what makes this case so disturbing, and so instructive about the downstream consequences when cultural figures become objects of public glorification. Mangione attracted a following online after his arrest, with some treating him as a folk hero for allegedly targeting a health insurance executive. That kind of charged rhetoric around political violence and public figures has real-world consequences, and prosecutors appear to be arguing that Rinderknecht is one of them.
On January 24, 2025, investigators asked Rinderknecht why someone might commit arson in Pacific Palisades. His answer, as described in the memorandum, was chilling in its specificity. Prosecutors wrote:
"When investigators asked defendant why someone might commit arson in the Pacific Palisades, he responded that it would be out of resentment of the rich enjoying their money as 'we're basically being enslaved by them' and compared such an act of 'desperation' to the murder for which Mangione was charged."
That statement, if proven, draws a direct line between Rinderknecht's alleged ideology and his alleged crime. He wasn't speaking in the abstract. He was, prosecutors contend, describing his own motive.
On January 3, 2025, two days after the Lachman Fire, Rinderknecht allegedly took a screenshot of an article about Mangione pleading not guilty. And after allegedly sparking the fire, he asked ChatGPT: "Are you at fault if a fire is lift [sic] because of your cigarettes?" The chatbot responded, "Yes," according to the criminal complaint.
He also allegedly called 911 around the time of the fire. Federal investigators said cellphone geolocation data and 911 call records contradict Rinderknecht's statements about his location, placing him roughly 30 feet from the blaze as it grew.
Rinderknecht was arrested in October 2025. A federal court sketch dated October 9, 2025, showed him inside a courtroom in Orlando, Florida. He pleaded not guilty and faces up to 45 years in prison if convicted.
His attorney, Steve Haney, has signaled an aggressive defense. Haney told the New York Post there would be no plea deal:
"There's not going to be any possibility of a plea bargain. It's going to be all or nothing."
The defense plans to argue there is no proof Rinderknecht started the fire and that fireworks witnesses and firefighting failures are relevant factors. Court documents cited by the Post describe how law enforcement determined the Palisades Fire was a "holdover" fire from the Lachman blaze, one that "continued to smolder and burn underground within the root structure of dense vegetation" before being "fanned by hurricane force winds."
ATF Special Agent in Charge Kenny Cooper laid out the government's theory plainly: "The fire was a holdover fire, meaning it was deeply seated in dense vegetation and roots, and continued to burn undetected until catastrophic weather ensued, resulting in the Palisades Fire." Whether a jury finds the causal chain from a New Year's Day blaze to a January 7 inferno convincing enough to convict will be the central question at trial.
Questions about how public agencies responded to the initial Lachman Fire, and whether earlier intervention could have prevented the catastrophe, remain open. Those questions matter, but they do not erase the government's core allegation: that Rinderknecht deliberately set the first fire. The debate over how the law should protect people and property from deliberate harm is one that extends well beyond this case.
Luigi Mangione's attorney, Karen Friedman Agnifilo, pushed back hard on any effort to link her client to the Palisades Fire case. She told Fox News Digital:
"As we have stated before in multiple public court filings, Mr. Mangione does not support violent actions and does not condone past or future political violence. These repeated attempts to connect him to unrelated acts or to insinuate that he condones or supports these acts are irresponsible, dangerous and prejudicial."
Mangione himself attended an evidentiary hearing at Manhattan Supreme Court in New York on December 18, 2025. He has pleaded not guilty to the charges against him.
Agnifilo's objection is legally understandable. Mangione is not charged with anything related to the Palisades Fire. But prosecutors are not alleging he directed Rinderknecht. They are alleging that Rinderknecht latched onto Mangione as a symbol, and that his fixation helps explain why he allegedly did what he did.
That distinction matters. Prosecutors laid out the Mangione connection not to implicate Mangione but to establish Rinderknecht's mindset: a man who saw class resentment as justification for destruction.
Twelve people died in the Palisades Fire. Countless families lost homes. The combined toll of the Palisades and Eaton fires, 31 dead, hundreds of billions in damage, ranks among the worst fire disasters in American history.
If the government's case is right, those losses trace back to a man who was angry at the world, couldn't get a date on New Year's Eve, and decided the rich had it coming. That is not political protest. That is not civil disobedience. That is the kind of nihilistic rage that erupts when personal failure meets ideological permission to blame others.
Fox News Digital reached out to Rinderknecht's attorney for comment on the trial memorandum. No response was reported.
The trial will determine whether prosecutors can prove their case beyond a reasonable doubt. The open questions are real: What exactly happened at the Skull Rock trailhead? Why wasn't the Lachman Fire fully extinguished? Could firefighting agencies have done more?
But the memorandum's portrait of Rinderknecht, the searches, the rants, the ChatGPT query, the investigators' interview, paints a picture that is hard to look away from. A man steeped in resentment, allegedly inspired by a celebrated act of violence, who prosecutors say turned that resentment into a fire that consumed a community.
When a culture treats vigilantism as heroism, it shouldn't be surprised when someone takes the next step.
