A former Brentwood woman admitted Monday in court that she helped her then-boyfriend set fire to the body of a man he had just shot to death.

Sabrina Hornoff, 43, now of Davenport, Florida, pleaded guilty to second-degree criminal facilitation. Like her ex-boyfriend, Tommy Bisbal, 40, she had been charged with second-degree murder in the killing of Felix Hidalgo Jacquez, a Bronx drug dealer, in July 2012.

In return for her plea, Suffolk County Court Judge John Toomey Jr. agreed to sentence her to 5 years probation on June 27. Assistant District Attorney Robert Biancavilla said the plea deal is “based on the fact that Miss Hornoff cooperated with the office of the district attorney against Mr. Bisbal.”

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Hornoff was prepared to testify against Bisbal, the father of her two children, now 17 and 10 years old. Jury selection was scheduled to begin Monday for Bisbal, but he died last month in the Suffolk County jail in Riverhead. No cause of death has yet been determined.

Both Biancavilla and defense attorney Daniel Russo of Westhampton Beach said the investigation showed that although Hornoff was aware that Bisbal intended to kill Hidalgo, she had nothing to do with it.

Biancavilla said Bisbal lured Hidalgo, a rival drug dealer, to Medford and shot him in the head and neck at an office building parking lot. Hornoff then helped dispose of the body nearby, she said in court.

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“I burned it with gasoline,” she said.

The couple’s younger child, then 7, was at the scene, authorities have said.

Video surveillance showed Bisbal driving Hidalgo’s sport utility vehicle, probably with the body in the back, and filling up a gas can, Biancavilla said.

Russo said outside the courtroom his client, who was released from jail in January as part of her cooperation agreement, was psychologically and emotionally abused by Bisbal when they were together.

“This guy, Bisbal, had complete control over her,” Russo said. “He dominated her, and she didn’t have a choice.”

Hornoff and the couple’s two children now live with Bisbal’s sister in Florida and Hornoff is working to get her life under control, Russo said. He noted that until this arrest, she had no criminal record.