A 29-year-old man from Guatemala died in custody Saturday after being apprehended by the U.S. Border Patrol in Casa Grande.

The man was apprehended on the evening of March 25 and started to show signs of distress the next morning at the Tucson Coordination Center. 

Customs and Border Protection medical personnel attended to him immediately, but he went into cardiac arrest after emergency medical services arrived, according to a statement from the agency. 

The CBP’s Office of Professional Responsibility has initiated a review of the incident, and the man’s death will also be reviewed by the Pima County Medical Examiner’s Office.