The man stabbed by a random attacker in a Bronx subway station died early Friday — as cops released chilling video of the Thursday night attack. 

The 38-year-old victim — who was brutally assaulted at the 176th Street and Jerome Avenue station, just outside the northbound No. 4 train — succumbed to his injuries around 6 a.m. Friday, authorities said. 

The footage, released by cops a short time earlier, shows the victim and the suspect — wearing all black — scuffling on the northbound platform while the train was still in the station. 

The victim, wearing a red-and-white jacket, was knifed multiple times in the back and chest during the unprovoked 8:30 p.m. attack, cops said.

The victim was taken to St. Barnabas Hospital, where he was initially listed in serious but stable condition before he took a turn for the worse, authorities said. 

A woman answering the phone at a possible address for the victim’s mother Friday wept as she told The Post, “He was my baby child.’’

A family friend who’d known the victim since he was a baby said he was a father to multiple children.

“He was a good guy. Always with his kids,” the woman said.

“It’s heartbreaking.”

No arrests had been made by Friday evening. 

The suspect — who fled westbound on East 176 Street — is described as having a dark complexion and is around 5 feet 11 and 160 pounds, with a medium build. 

The individual was last seen wearing a black hooded sweatshirt, black sweatpants, black Nike sneakers with a gray logo and carrying a black backpack.