The Brooklyn fiend who fatally shot his ex as she pushed their infant in a stroller smirked Tuesday while giving a pathetic apology in court, where his victim’s mom wept — and he landed up to life behind bars.

Controlling killer Isaac Argro, 26, licked his lips and grinned when given the chance to address the Manhattan courtroom before being sentenced for shooting Azsia Johnson, 20, point-blank in the head on the Upper East Side in June 2022.

“I know what I’m about to say doesn’t really mean anything to anybody, but I just wanted to say that I’m sorry for whatever I did or whatnot,” the sicko said while slumped in his chair.

Argro was seen smirking at points during the testimony. Steven Hirsch for NY Post

“I know I can’t bring nobody back.”

Johnson’s shattered mom, Lisa Desort, 59, wept as she ripped into the “coward” before he was slammed with 25 years to life in prison.

“It’s been the worst four years of our life,” she told the judge as a family member rubbed her back.

She said she treated Argro like a son before he began his vicious descent into murder.

 “And this is how you repay my family?” she asked him.

Argro harassed, stalked and threatened Johnson and her family for several months, almost forcing the aspiring pediatric nurse to miscarry from one of his beatings, before the slaying, according to prosecutors.

Argro fatally shot his 20-year-old ex Azsia Johnson as she pushed their infant in a stroller on the Upper East Side in 2022. Nefertari Jay / Facebook

A terrified Johnson  had been living in an East Harlem domestic-violence shelter with their 3-month-old daughter Khloe and her older child Kenzo, who she had from a previous relationship, when she was killed.

She had tried to protect them all from his abusive wrath — but  the dad ended up luring her to East 95th Street between Lexington and Third Avenues that day with promises of items for their baby.

Instead, Argo, with a black ski mask over his face, pumped a bullet in her head as she pushed little Khloe up a hill in her stroller.

Argro then fled and threatened Johnson’s family, telling them they were “next,” according to prosecutors.

Controlling killer Isaac Argro, 26, licked his lips and grinned when given the chance to address the Manhattan courtroom before being sentenced for shooting Azsia Johnson, 20, point-blank in the head on the Upper East Side in June 2022. Steven Hirsch for NY Post

It took a Manhattan jury fewer than two hours to find him guilty of murder.

“The worst part of it all is my grandchildren,” Desort said in court Tuesday, referring to the kids as “orphans” left in foster care after Argro wrecked the tight-knit kin.

“Khloe and Kenzo’s lives will never be the same again because of Mr. Argro. My grandchildren have lost one of the best mother’s God could have given them,” she said, her voice breaking down in the courtroom.

“Khloe will never have a normal life and Kenzo is living with people that he shouldn’t be living with, and I continue to fight to this day for them, and I will not stop.”

Lisa Desort hugged by DA Alvin Bragg. Steven Hirsch for NY Post

She urged Manhattan Supreme Court Justice Gregory Carro to throw the book at the killer — who was previously caught in court laughing “as if he was going to get away with it,” according to Johnson’s older sister, Destiny Johnson, at the time.

The judge did as she asked — with the victim’s family breaking into applause in the courtroom as he delivered the harsh sentence.

Carro called the murder a “senseless domestic violence killing,’’ adding, “The one purpose, which was pretty clear to me, had nothing to do with a child.

“Nothing. It had do with a ‘I can’t have you, no one can have you.’

Argro was sentenced to up to life behind bars. Steven Hirsch for NY Post

“You can’t stand having an independent, strong willed woman to defy you. That was pretty obvious,’’ he told Argro.

Manhattan District Attorney Alvin Bragg touchingly hugged the heartbroken Disort outside of the courtroom.

Bragg said Johnson was just beginning to “rebuild her life” when she was killed.

“Her dreams of moving forward were brought to a horrific end when her ex, Isaac Argro, executed her in cold blood in front of their infant daughter,” he said in a statement.

Disort told The Post her daughter’s killer “showed no remorse” in the courtroom.

“It’s the day we have been waiting for,” she said.