Nassau County District Attorney Anne Donnelly announced that Mark Small, 57, from Elmont, was convicted of second-degree murder and criminal possession of a weapon in the July 2022 shooting of his girlfriend in a luxury apartment building in Mineola.

His conviction was one of three jury trials prosecuted by the Nassau DA’s office that returned three guilty verdicts for murder on the same day last week, Sept. 26.

The Small trial in Nassau County Court started Sept. 5, and the jury deliberated for approximately five hours before delivering their verdict. Judge Helene Gugerty presided over the case.

Small is due back in court for sentencing Oct. 25, and faces up to 25 years to life in prison.

Donnelly said Marivel Estevez, Small’s girlfriend, worked in management at the Allure Mineola apartment complex on Old Country Road and resided in a top-floor apartment.

Donnelly said between the evening hours of July 28, 2022, and the early morning hours of July 29, 2022, Small shot Estevez with a handgun once in the arm and once in the head and then fled in Estevez’s car with her dog, Tuffy.

When Estevez failed to show up for work on July 30, 2022, an employee called police for a wellness check. Responding Nassau County Police Department officers found Estevez dead on her bed.

Small was arrested on Aug. 2, 2022, at North Shore University Hospital in Manhasset by members of the Nassau County Police Department. Small was being treated at the hospital after being struck by a car chasing after Estevez’s dog, who had escaped from him on the Long Island Expressway.

“Mark Small murdered his girlfriend in cold blood in the middle of the night, shooting her twice and leaving her lifeless body on their bed as he locked up the apartment behind him and drove off in her car,” Donnelly said. “Marivel was violently killed in what should have been a sacred space — her own home — because the defendant could not accept that she wanted a fresh start outside of New York and away from him.”

She added, “We thank the jury for their verdict finding this defendant guilty of murdering Marivel and we hope that this conviction provides her family with a sense of justice.”

On Sept. 26, juries returned guilty verdicts in three separate murder trials prosecuted by Nassau County DA’s Homicide/Major Offenses Bureau in a span of less than three hours. Along with Small, Thomas Massenburg and Quay Sean Hines were found guilty on all counts after their trials.

“Yesterday was a historic day for justice in Nassau County,” Donnelly said in a press release Thursday. “For the past few weeks, prosecutors in my Homicide Bureau have been painstakingly detailing our evidence of these defendants’ violent crimes across multiple jury trials, and yesterday afternoon after brief deliberations those juries convicted each of the defendants of murder and other charges in a whirlwind three hours in the Nassau County Courthouse.”

She went onto say, “This remarkable afternoon is a testament to the compelling and formidable cases argued by the exceptional prosecutors in my office and my steadfast commitment to seeking justice for victims and ultimate accountability for defendants who violate the law.”