A woman was in Nassau police custody late Monday night in connection with the stabbing death of an Oceanside woman earlier in the day, police said.

Neither the victim nor the suspect was identified by police.

Det. Capt. John Azzata, commanding officer of the Nassau Homicide Squad, said police were working with the district attorney's office on filing charges.

VideoPolice: Woman fatally stabbed in OceansideDataLI crime stats

The Nassau district attorney's office declined to comment late Monday night.

Azzata would not reveal the relationship between the victim and the suspect. But "it's not a random act," Azzata said. "The community has nothing to be afraid of."

Azzata said Fourth Precinct officers responded at about 12:48 p.m. Monday to Terrell Avenue in Oceanside after a report of an assault. Officers found a woman bleeding "profusely" from the neck, he said.

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She was pronounced dead at a hospital at about 2:55 p.m., Azzata said.

Azzata declined to detail her injuries and said more information would be released Tuesday morning.

Neighbor Keriann Prisco, 24, said she heard a commotion Monday afternoon while she was hanging out in her backyard pool on nearby Charles Street.

"I was in my pool and I heard a scream," she said. "It was just a yell."

A few minutes later, she said, she heard sirens and helicopters overhead.

She said detectives interviewed her about what she heard.

"They didn't tell me anything," said Prisco, a student. "They just told me someone got stabbed."

Neighbors said the victim was an older woman who lived by herself.

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Residents flooded the sidewalks along Terrell Avenue and spoke in small groups -- shocked, they said, that someone had been killed there.

Carol Kelly said her mother-in-law lives next door to the home of the victim. Kelly said she had only spoken briefly to the woman.