Jose Ancelmo Pimentel was 45 when he was last seen on July 30, 2011, while crossing the U.S.-Mexico border near Lukeville, Arizona. He was part of a group trekking through the Sonoran Desert and, after two days of walking, became ill. His companions left him behind; he was last seen alone in the desert in a vulnerable state.

Pimentel is described as 6 feet 1 inch and 200 to 210 pounds, with very curly black hair and black eyes. He wore dark blue work pants with Jose embroidered on the back, a plain red short-sleeved T-shirt with the Dos Equis logo, and white Jordan shoes with red, green, and yellow stripes. He carried a wallet containing a photo of his sister and his passport. The Pima County Medical Examiner’s Office opened a case for him on September 21, 2011.

What led to him being left behind and what became of him after July 30, 2011 remain unknown; anyone with information about his crossing near Lukeville is asked to come forward.