Six illegal immigrants, including 14-year-old, found dead in shipping container along southern border

After initial examinations, authorities determined the 29-year-old woman died of hyperthermia.

While formal medical exams for the remaining five people are pending, officials said it is "highly probable" hyperthermia was the cause of death for the entire group.

The Webb County Medical Examiner's Office is working in close coordination with the Mexican Consulate to contact the migrants' families, confirm the final identity and assist with the repatriation process.

Webb County and Union Pacific did not immediately respond to Fox News Digital’s request for comment.