Dawn Diana Raines-Hewes is charged with murder in Tuesday's death in Fairfield

A California woman faces murder charges after she allegedly drowned her 4-year-old grandson in a bathtub intentionally on Tuesday.

Officers in Fairfield, California, responded at 10:51 a.m. Tuesday to a report of a drowning in the 1400 block of Jefferson Street and found the boy unconscious and not breathing, according to a police statement obtained by PEOPLE. Attempts to resuscitate him failed, and he died at a local trauma center.

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Police arrested his grandmother, Dawn Diana Raines-Hewes, 51, whom they believe placed the boy in a bathtub and intentionally drowned him. Two other grandchildren who were in Raines-Hewes’s care at the time – a 6-year-old girl and 1-year-old girl – were unharmed, police said.

Detectives decided the drowning was intentional after examining “evidence at the scene, including statements that were provided – statements from the grandmother herself,” Fairfield police officer Cleo Mayoral told KNTV-TV.

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Raines-Hewes was booked into the Solano County jail on murder charges. She is being held without bail as the department investigates further.