Kimberly Phillips, who was identified by the medical examiner’s office, was under medical observation while at the Tarrant County Jail, according to the release. She was taken to John Peter Smith Hospital on Feb. 15 and died three days later “under the direct care of the medical staff,” the release states.

Inmate deaths in Tarrant County are investigated by Tarrant County Sheriff’s Office jail staff, the TCSO Criminal Investigations Division, an outside law enforcement agency, JPS medical staff, The Texas Commission on Jail Standards, the Tarrant County Medical Examiner’s Office and the Texas Attorney General’s Office.