The Madera County coroner’s office is investigating the death of a woman imprisoned at the Central California Women’s Facility in Chowchilla over the weekend as temperatures continue to reach into the triple digits.

California Coalition for Women Prisoners, an advocacy group for incarcerated women, said the woman suffered from heat-related illness after she had become incoherent and collapsed in a shower while trying to cool off.

“It was heat exhaustion,” CCWP said in a statement, quoting a fellow inmate who wished to remain anonymous out of fear of reprisal. “She dropped to the ground and her legs started shaking and wouldn’t stop.”

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