STAMFORD — The scars on the hands of a New York businessman are a constant reminder of the night out drinking with a woman that turned violent when he arrived at her Springdale condo.

The man says he was “tipsy” after having about eight drinkings with the woman at several bars in White Plains, N.Y.

The 45-year-old man, who lives in New Jersey, didn’t realize the woman was receiving threatening text messages from her estranged boyfriend as they drove back to her Stamford home.

The man asked the woman to use her bathroom when they arrived at her place. He then described what happened next in one word: “Wham,” he said this week during his hours of testimony at state Superior Court in Stamford.

Cesar Olivero, who has a young child with the woman, is on trial for home invasion, first-degree assault and burglary for the June 2015 incident that nearly chopped the man’s hand off, police said.

The man testified he saw Olivero, who was 35 when the incident occurred, coming toward him with a 10-inch handsaw, swinging the bade at him. Police said the victim told them Olivero was screaming in Spanish, accusing him of having an affair with his estranged girlfriend.

The victim testified Olivero kept swinging the 15-inch saw, slashing him 15 to 20 times. The man suffered deep wounds to his hands as he tried to defend himself. The man also sustained about five large cuts on his skull.

“I was fighting for my life,” the victim testified while being cross-examined by Olivero’s attorney, Philip Russell.

About half of the man’s left hand was cut off, but New York doctors were able to reattach it.

The man said he never saw the woman after the attack.

On the night of the incident, the woman told police she and Olivero had been broken up for two weeks. Police said she provided a text message she sent Olivero the previous day about returning the keys to the Springdale condo they had shared for about a year.

However, the woman downplayed the breakup when she took the witness stand this week. She said they never really broke up.

The woman also denied most of what she told police and testified she did not see the assault.

Supervisory Assistant State’s Attorney Paul Ferencek told the judge the woman has not been cooperative.

jnickerson@stamfordadvocate.com