Azzarello remained on fire for several minutes before first responders got to him.
Onlookers scrambled to escape the intensity of the heat radiating from the flames.
But because the area was cordoned off, first responders struggled to access Azzarello.
Eventually, dozens of police officers arrived to extinguish the flames.
Six first responders suffered minor injuries in the chaos, the FDNY said.
Azzarello was outside the Manhattan Criminal Courthouse when he spread pamphlets advertising conspiracy theories around the park at about 1:35pm on Friday.
He then covered himself in a flammable liquid and lit himself ablaze.
Some of the documents he left strewn about the park also had a link to a Substack that started, “I have set myself on fire outside the Trump Trial.”
Azzarello, who shared a manifesto online before committing his final act, was spotted with signs in different parts of New York City on Wednesday and Thursday.
He was seen in Washington Square Park wielding a sign singling out New York University on Wednesday. On Thursday, he was in Collect Pond Park displaying a sign with the message: "Trump is with Biden and they're about to Fascist coup us."
The man who lit himself ablaze on Friday afternoon outside the Lower Manhattan courtroom where Donald Trump's trial is being held has reportedly died.
Max Azzarello, of St. Augustine, Florida, remained on fire for about three minutes while first responders attempted to get to him in the designated protest area.
Azzarello was rushed off into an ambulance and was reportedly in critical condition at Weill Cornell Medicine - Burn Center.
Officials said he was unlikely to survive his injuries. The New York Times reported his death early on Saturday morning.
