An intern returned to a Delaware hospital hours after he was reportedly fired to allegedly shoot two teenage coworkers, killing one of them, according to authorities. 

John Wallace-Bey, 23, is facing a slew of charges, including first-degree murder, after he was identified as the suspect who allegedly gunned down a 19-year-old man and seriously wounded another co-worker, also a 19-year-old man, at Wilmington Hospital on Tuesday, according to the Wilmington Police Department and NBC10.

Wallace-Bey, of New Castle, allegedly blasted off shots hitting two hospital employees around 3:30 p.m., which triggered the campus into a lockdown, according to cops and local reports. 

The wounded victim remains in critical but stable condition. The identity of the deceased victim will be released at a later date, the Wilmington Police Department said in an update Wednesday. 

The gunman was an IT intern at Wilmington Hospital and had been axed from his job earlier Tuesday before returning to carry out his deadly rampage, a source and an employee told NBC10. 

Wallace-Bey managed to flee the hospital after the shooting and was eventually tracked across state lines to Philadelphia, where he was taken into custody in the city’s Olney neighborhood.

The gun-wielding ex-intern, who sped away from the scene in a white Toyota RAV4, was eventually nabbed in an Uber ride in Philadelphia, the outlet reported. 

The motive remains unclear, though police said the shooting appears to be a targeted and isolated incident.

A lockdown at the hospital was lifted by 7:30 p.m. on Tuesday, after staff were seen on video being led out of the medical center in Wilmington with their hands raised. 

Wallace-Bey had no criminal history and was described by neighbors as a quiet and introverted young man.

“I was shocked, like, when you talk about things happening close to home, literally right next door,” John Richardson told the outlet.

“So, I was completely shocked, and it’s just an unfortunate situation that lives were taken yesterday.”

Vynisha Richardson, an employee at Wilmington Hospital, told NBC10 that she frequently saw Wallace-Bey at work — and urged the hospital to implement more security measures to prevent future tragedies.

Wilmington Hospital employees also told the outlet that visitors pass through metal detectors at the hospital’s main entrance, but workers can flash a badge to bypass the security.

“As of yesterday, I think that needs to change,” Richardson urged. “There should be metal detectors and maybe a constable or security guard at every entrance to this hospital.”

Wallace-Bey will be extradited to Delaware, where he faces charges including first-degree murder, first-degree attempted murder, two counts of possession of a firearm during the commission of a felony, and carrying a concealed deadly weapon, cops said.

“I’m heartbroken for the victims and their loved ones, for the ChristianaCare team, and for the entire city of Wilmington. Violence has no place in our community,” Wilmington Mayor John Carney said in a statement on Wednesday.

“It’s particularly distressing that such violence and tragedy unfolded at a facility with a primary function of providing lifesaving care. Our healthcare workers and their patients should never fear for their safety.”