Woman who entered ocean with infant suspected of murder-suicide attempt

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A 36-year-old woman was arrested Tuesday after authorities say she attempted to kill herself and an infant by entering the frigid ocean from a Half Moon Bay beach.

San Mateo County sheriff’s deputies responded to Poplar Beach about 3:10 p.m. on a report of a possible suicidal person. They arrived and found Chisato Chiyoda, 36, of Cupertino, holding an infant. Both were soaking wet in the 56-degree weather, deputies said.

“Minutes prior, Chiyoda was seen entering the ocean waves with the infant in what we later learned was an attempted murder-suicide,” the sheriff’s office said.

Chiyoda and the infant were treated for hypothermia and taken to a local hospital for further evaluation.

“Detectives spoke with Chiyoda further about the incident, and when she was released from the hospital, Chiyoda was arrested for attempted murder,” sheriff’s deputies said.

After being treated at the hospital, the infant was released to Child Protective Services.

The investigation is ongoing and anyone with information is encouraged to contact Detective Velasquez at 650-363-4062 or at jvelasquez@smcgov.org. Alternatively, you may also remain anonymous by calling the San Mateo County Sheriff’s Office Tip Line at 1-800-547-2700.


  1. Umm, you might want to correct that to Hypothermia. Hyperthermia is overheated & this doesn’t sound like that would be the case here.

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