Sergio was with a group of about 20 people crossing from Reynosa (Tamaulipas, MX) to Brownsville, TX. The group stayed in McAllen for a couple of days before they were handed over to a different guide. They may have driven nort on Highway 77 before reaching a checkpoint (If they stayed on 77, they would be hitting the Sarita BP Checkpoint, however it was not specified which checkpoint they hit). They walked for a day before Sergio send a text message to his brother-in-law that he thought the group was half way and they only have one day more of walking. The groups' final destination was Houston, TX. (Information retrieved from NamUs.gov)