Police officials on Wednesday named a woman and her 2-year-old child whose bodies were found near the desolate stretch of Long Island seafront that was the scene of the Gilgo Beach serial killings.

The woman had long been known as Jane Doe No. 3 — or Peaches, after a fruit tattoo on her torso — and was thought to be the mother of the toddler whose body was also found along the South Shore beach.

She was Tanya Denise Jackson and her daughter was Tatiana Marie Dykes, Detective Capt. Stephen E. Fitzpatrick of the Nassau County Police Department said at a news conference.

Rex Heuermann, a Massapequa Park, N.Y., architectural consultant, has pleaded not guilty to killing seven women, six of whose remains were found off Ocean Parkway.

Of the 10 victims found in the Gilgo area, nine have now been identified. The authorities did not say whether they believe Mr. Heuermann killed Ms. Jackson and the child.

“I’m not saying it is him, I’m not saying it’s not him,” Captain Fitzpatrick said. He added that although Ms. Jackson’s and Tatiana’s murders were being investigated with the Gilgo Beach slayings, they could be unrelated.

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