Coroner Jack Hawkins ruled the death of 27-year-old Sheena Totus of Wapato a suicide.
She had been booked into jail Friday on misdemeanor traffic offenses.
The jail's Scott Himes told the Yakima Herald-Republic Totus was placed alone in a cell because she wasn't getting along with other inmates. She was found hanging 13 minutes after she was last checked.
The jail has more than 600 inmates.
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