A man who was once arrested for randomly slashing a stranger is the suspected Brooklyn serial attacker who fatally stabbed an 83-year-old man — just after the victim had won the lottery, cops and friends said Sunday.

The details emerged alongside chilling revelations about the deadly assault, which was caught on surveillance video and includes the assailant kicking the beloved elderly man for good measure after stabbing him, according to police sources quoted by The Washington Post.

Suspect Joevani Vale, 26, is accused of randomly slugging a woman, slashing another female stranger, and then following and ambushing elderly Ramon Cintron in less than an hour during Saturday’s Boerum Hill crime spree, according to cops.

Vale is now being sought by police.

“We were supposed to go visit [Cintron] on Friday, and he wasn’t feeling well, so he had to go into the hospital,” Angel Cintron, the tragic man’s nephew, told The Post, noting that his uncle had a pacemaker. “He came out Saturday morning, and the first thing he did was go over to that corner deli and play his numbers.”

“He used to go to the corner to play the numbers. He did that his entire life.”

Cintron scored in a game of chance, according to two neighbors who told The Post on Sunday.

It was unclear how much money the victim had won, but Angel stated that police informed the family that Ramon’s wallet had gone missing, which “makes perfect sense” now.

“The only reason someone would hurt him is if he committed a robbery.” “He was so nice to everyone,” Angel said of his uncle who died.

Cintron’s niece, Elisa, said Ramon, nicknamed “Flaco,” Spanish for “Skinny,” “was so full of life.”

“He was very independent and genuinely nice, happy, and friendly,” she said. “He worked at the same pharmacy until it closed down.” He worked until he was in his 70s.”

Her father, Ramon’s brother, she claims, “isn’t doing too well.”

“He has a very difficult job of informing everyone in the family about what happened,” Elisa said. “He’s taking it hard.” I’ve never seen him look like this before. Nobody ever imagined Flaco leaving in this manner.”

Ramon was loved by the victim’s neighbors as well.

“I love that old man like my grandfather,” Victor Santiago, manager of Papa Firo Grocery in Boerum Hill, said on Sunday to The Post of Cintron. “He comes every day at 5 p.m. and hangs out, playing Lotto and scratch-off tickets.” He does everything for everyone.

“He’s like a grandfather around here,” Santiago said.

Vale has at least three prior arrests, including one in September 2020 for slashing a stranger in Brooklyn.

Vale was charged in that case with criminal possession of a weapon, menacing, and assault in connection with an attack on a 36-year-old man in front of 502 President St. in Carroll Gardens.

Vale had previously been charged with forcible touching in Crown Heights, Brooklyn, in 2016 and public lewdness in the 84th Precinct, which includes Boerum Hill, in 2015.

According to police, he was identified in Ramon Cintron’s slaying by surveillance cameras in the area.

Vale and Cintron lived in the same Wyckoff Gardens public housing complex, in the same building.

According to police sources, Vale’s alleged violent spree began around 1 p.m., when he allegedly slugged a 47-year-old woman at the intersection of Pacific Street and Third Avenue.

Less than a half-hour later, he allegedly slashed another woman, 31, in the leg in front of 134 Nevins St. before fleeing, according to cops.

Cops discovered Cintron lying on his back in a pool of blood shortly before 2 p.m. after he was stabbed to death in the elevator on the 19th floor of Wyckoff Houses — just steps from his apartment, according to police.

According to sources, surveillance cameras in the building show Vale entering the building around 1:30 p.m. and disappearing from view for about 11 minutes before returning to the lobby in different clothes.

He then enters the elevator with Cintron, and the two are seen chatting before Vale allegedly whips out a knife and stabs the elderly victim in the neck, according to sources.

Vale then allegedly kicks Cintron before running to the stairwell and fleeing the scene, according to sources.

The elevator takes Cintron to the 21st floor, where his foot prevents the door from closing and a neighbor notices him and calls 911, according to the sources.

The elderly victim died at the scene from slash wounds to his neck and right arm.

“Everyone loved Flaco,” the neighbor said. “He was a man with a lot of heart.”

“He goes over to that grocery store every day, Papa Firo, and plays the number, and yesterday he was going to collect on a winner,” a friend explained. “And he went after him.

“I stay away from him,” the neighbor said of Vale.