A Mexican woman who was in Border Patrol custody died over the weekend, the U.S. said Monday.

Customs and Border Protection (CBP) said in a statement Monday that the 33-year-old woman, who is not identified in the statement, was found by a Santa Cruz County Sheriff’s deputy near Tubac, Arizona.

She was taken to an area hospital where she received treatment while in Border Patrol custody, according to CBP.

"Customs and Border Protection is saddened to report that the individual succumbed to her injuries while still in the hospital, and was pronounced deceased by medical authorities on Saturday," the statement said.

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Santa Cruz County Sheriff Sgt. Santiago Gonzales told The Arizona Republic that authorities responded to a call from a passerby who found the woman lying on the shoulder of a road about 15 miles north of the U.S.-Mexico border.

"Our deputies were the first on scene and according to the information I have is that she was suffering from some type of heat injury," Gonzales said. "She hadn't eaten or drank anything in a couple of days. She was by herself at the time."

Pima County medical examiner Gregory Hess told the newspaper the woman had "profound dehydration" and kidney failure, and had experienced complications during her hospital stay.

"The bottom line is she went with kind of profound dehydration and kidney failure, probably due to an extended trek through the desert," Hess said. "While they were treating her for that, she developed multiple subsequent complications and then she had this extended hospital course."

The woman's death comes less than a week after a 49-year-old man died of a pre-existing heart condition while in Border Patrol custody.

Two additional migrants have died in Immigration and Customs Enforcement (ICE) custody this month.