A suspected drunk driver, who police say crashed his truck into a crowd of people during a Fourth of July celebration in New York City on Thursday – killing three and injuring eight, is a wellness advocate and a substance abuse counselor, sources say.

Daniel Hyden, 44, of New Jersey, was driving a Ford F-150 pickup truck at a high rate of speed when he ran a stop sign at an intersection, mounted a sidewalk and smashed into a group who were enjoying the evening at Corlears Hook Park in the Lower East Side at around 9 p.m., police said. 

Three people have now been confirmed dead – Lucille Pinkney, 59, and her son, Hernan Pinkney, 38, as well as an unidentified female – after the holiday celebrations turned deadly in horrific circumstances.

AT LEAST 2 KILLED, MULTIPLE INJURED IN NYC AFTER PICKUP TRUCK CRASHES INTO CROWD

Daniel Christopher Hyden mugshot

A previous booking photo of Daniel Christopher Hyden, who police say drove his truck into a park on July 4, 2024, killing three people. (NYPD)

Eight other victims were injured, including an 11-year-old child.

"Responding officers who did arrive on the scene did smell some alcohol," said NYPD Chief of Department Jeffrey Maddrey said at a late-night police briefing. "There were people who were there at the scene who grabbed the driver, removed the driver and made sure the driver didn't leave."

So far, Hyden has been charged with three counts of driving while intoxicated with alcohol or drugs, and one count of operating a vehicle without a license. He is expected to be hit with several more charges.

Police investigate a crash scene with a white truck in a park

Firefighters and police respond after multiple people were struck by a pickup truck inside Corlears Hook Park in Manhattan, New York City on Thursday, July 4 2024. (Gardiner Anderson for NY Daily News/Getty)

He was perp walked out of the 7th Police Precinct at 1:50 p.m. Friday where he was heckled by New Yorkers – and relatives of the victims – who shouted expletives at him.

Heyden was wearing a white t-shirt splattered in blood and had noticeable swelling and marks on the left side of his face. He kept his head down at all times and limped in handcuffs to a nearby patrol vehicle while being held by two detectives. 

"You killed Hernan Pinkney, you f---ing b-----d… you don't deserve air," one woman screamed. Another man, who said he was Hernan Pinkney's step-father, also roared at Heyden.

CENTRAL PARK ATTEMPTED RAPE SUSPECT WHO ATTACK SUNBATHING WOMAN IS CHARGED, POLICE SAY

Hyden perp walk after truck crash incident

Heyden was perp walked out of the 7th Police Precinct at 1:50 p.m. Friday where he was heckled by New Yorkers – and relatives of the victims – who shouted expletives at him. (Fox)

Hyden reportedly wrote a book in 2020 titled "The Sober Addict," which claims to be a guide on "how to be functional with the dysfunctional disease of addiction."

"This guide will help you learn how to function with this dysfunctional and chronic illness," the book’s bio on Amazon reads. 

In the book, Hyden describes himself as an "ex-professional addict…with over 18 years of use and abuse experience" and claims "addicts don’t choose addiction — addiction chooses them," the New York Post reports.

Hyden’s Amazon author bio lists him as a substance abuse counselor, instructor and public speaker. The New York Post was first to report that the suspect in the case had penned the book.

Police investigate a crash scene with a white truck in a park

The truck Daniel Hyden is alleged to have been driving is pictured on July 4, 2024 after crashing into a Manhattan park and killing three people in New York City. (Gardiner Anderson for NY Daily News/Getty)

He has a prior arrest fpr assualt in February was charged with a traffic offense and driving under the influence in Wisconsin in 2015, the publication reports, citing court records show. He pleaded guilty to the former charge and the latter was dismissed.

Responding firefighters on Thursday found the four victims – including the three deceased – underneath the truck when they arrived on the scene.

"They used their airbags, floor jacks and cribbing in order to lift the vehicle off of the victims," FDNY Assistant Chief Michael Meyers said at the press conference.

Video from the scene shows the front of the truck smashed, and it is surrounded by several park benches and debris like empty cups strewn across the floor. 

Lucille Pinkney and her son Hernan Pinkney who died when a truck hit them

Lucille Pinkney, left, and her son Hernan Pinkney, who died when the truck hit them. (Obtained by Robert Moses via Fox 5)

CLICK HERE TO GET THE FOX NEWS APP

New York City Mayor Eric Adams also briefed the media and said that the victims were simply out celebrating when the deadly incident unfolded. 

"We had a tragic incident which took place here," Adams said. "A driver drove into a crowd of people who were actually just celebrating like so many New Yorkers and Americans are doing right now."

He said the incident was not terror-related.

Fox News' Alexis McAdams and CB Cotton contributed to this report. 

Press Briefing Eric Adams truck crash

FDNY Assistant Chief Michael Meyers speaking at the press conference. (Benny Polatseck/Mayoral Photography Office)