“Hell on wheels” killer Mackenzie Shirilla confessed to killing her boyfriend and a pal by deliberately crashing her car into a building — and kept a twisted scrapbook about the fatal wreck, a former inmate has claimed.

Shirilla, 21, has always publicly insisted that the 2022 car crash that killed her beau, Dominic Russo, 20, and friend Davion Flanagan, 18, in Cleveland, Ohio, was an accident.

But the convicted murderer seemed “amused” by the story when she told fellow inmates, according to Anastasia, 30, who was holed up with Shirilla in the Ohio Reformatory for Women.

Mackenzie Shirilla looking at the camera.
“Hell on wheels” killer Mackenzie Shirilla allegedly confessed to deliberately killing her boyfriend and a pal to fellow inmates.COURTESY OF NETFLIX
“She said she was suicidal, but she almost looked as though she was enjoying [telling the story] — like she was amused by it,” the former inmate, who did not want to give her last name, told the Daily Mail.

Shirilla allegedly said, “Dom had to die” when she described deliberately crashing her Toyota Camry into a brick wall at 100 mph, according to Anastasia.

The former inmate said the killer, dubbed “Hell on wheels” by a judge at her sentencing, regularly abused K2 — a synthetic drug made of chemically sprayed smoking paper — behind bars, and often went on unhinged rants about her crimes.

“She said the devil made her do it. She said the devil was pressing on her foot,” said Anastasia.

“She wanted to make it sound like she was a little devil girl, and that this is what she intended to do. Like there was a reason that Dom had to die,” she added.

Shirilla also allegedly kept a picture of a brick wall with the word “BOOM” written on it in a scrapbook, in an apparent twisted joke about her deadly crash, according to Anastasia.

“She didn’t have pictures of Dom or Davion [in her scrapbook]. I felt like that was cold,” she added.

Dominic Russo and Mackenzie Shirilla.
Dominic Russo (left) was killed when his girlfriend Shirilla deliberately drove into a building in Cleveland, Ohio.Mackenzie Shirilla

A headshot of Davion Flanagan, a young man with dark curly hair and a wide smile, wearing a black shirt and gold chains.
The couple’s friend Davion Flanagan was also killed in the crash.Jardine Funeral Home
Anastasia also pushed back at Shirilla’s claims that she “passed out” behind the wheel due to a rare blood pressure condition.

Shirilla told the Netflix documentary “The Crash” that she suffers from postural orthostatic tachycardia syndrome and was unconscious when she crashed her car.

“I never saw her pass out,” said Anastasia.

It is the latest allegation of Shirilla’s wild behavior behind bars, including flashing her breasts at visitors and keeping nude pics in her cell, according to her disciplinary record.

Shirilla’s friend told The Post this week that she believes the killer’s parents didn’t care about her but spoiled her.

The severely damaged rear of a black car with the passenger side almost completely torn away, revealing the interior.
Shirilla drove the Toyota Camry into a brick wall at 100 mph.City of Strongsville
“From what I see, they didn’t really care about her. They cared more to have her approval,” said Jaina Maynard, who went to middle school with Shirilla.

It comes as Shirilla’s attorneys continue to fight the Ohio Supreme Court after it rejected her appeal because it was filed after the deadline.

Her campaign for a new trial was also denied in March, meaning she now faces no possibility of parole until 2037.