A New Hyde Park woman was fatally stabbed in her home Tuesday and her son is a "focus" of the investigation, police said Wednesday.

Homicide Squad Det. Sgt. James Skopek said police were summoned to the Knolls Drive home by a 911 call about 6:20 p.m. Tuesday. Irwin Bloom had come home and discovered his wife Sandra Bloom, 67, lying on the kitchen floor, police said.

Sandra Bloom was stabbed in the neck with a large kitchen knife, that police recovered in the kitchen, Skopek said. She was pronounced dead there.

VideoWoman fatally stabbed, son treated for overdoseDataLI crime stats

Bloom's son, Vaughn H. Bloom, 44, who lives at the home with his parents, was found unconscious on the couch and had apparently overdosed on an unknown substance, Skopek said. A needle was found nearby, he said.

Vaughn Bloom was taken to North Shore University Hospital in Manhasset and Wednesday was in the ICU in a "somewhat stable condition" and "breathing on his own," Skopek said.

"He's definitely a focus of the investigation," said Skopek during a news briefing Wednesday at police headquarters in Mineola. No arrests have been made, but police said they do not believe the person responsible is at large. There were no signs of a break-in, Skopek said.

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The son, who was unemployed, had "psychological issues," his father told investigators, Skopek said.

Insp. Kenneth Lack, a police spokesman, said officers have been called to the home several times to take Vaughn Bloom to the hospital because he was "a danger to himself or others."

Sandra Bloom was a longtime New York City schoolteacher, most recently in Queens, neighbors said. A NYC Department of Education spokesman last night said he could not immediately confirm her employment.

A man at the home last night declined to comment and asked for privacy.

Nassau Homicide Squad detectives removed a computer from the home Wednesday.

Roberta Buble, who lives across the street, said Sandra Bloom was a teacher and grandmother and also has a daughter who lives in Florida.

"We were friendly neighbors," said Buble, 49, who works in human resources. "It's just terrible what happened . . . You don't hear of things like this in this neighborhood."

She said she had seen police at the home "a number of times through the years," but didn't know why. Vaughn Bloom, she said, "stayed to himself" and was "very rarely seen outside."