ELOY, Ariz. - A woman from Guatemala died Sunday while in immigration detention in Arizona, marking the third in-custody death nationwide for Immigration and Customs Enforcement since Oct 1.

ICE announced Monday that 36-year-old Raquel Calderon de Hildago died at a hospital near the Eloy Detention Center after suffering a series of seizures.

She was transferred to ICE custody Nov. 23, six days after the Border Patrol apprehended her. ICE says she was awaiting removal to her home country.

Immigration activists have been critical of the Eloy Detention Center over its conditions, which they say have led to the deaths of 15 people since 2004. The center is run by a private prison operator. ICE has said its facilities are thoroughly inspected to ensure that people are in a safe environment.