WASHINGTON (CBSDFW.COM/AP) — A 16-year-old unaccompanied migrant boy from Guatemala who fell ill has died in government custody in Texas.

Officials say the boy was transferred to the care of U.S. Health and Human Services on April 20 and didn’t appear ill. But the next morning, he had fever, chills and a headache and was taken to a hospital, where he was treated and released that day.

He didn’t improve and was sent to another hospital, where he was transferred to a third facility, a children’s hospital. He died Tuesday.

A spokeswoman for the Administration for Children’s Services says the cause of death is under review.

Since 2015, two other unaccompanied children have died in HHS custody.

The death comes as a surge of unaccompanied children and migrant families cross the U.S.-Mexico border.

Last October, the Dallas City Council unanimously passed a resolution “to establish itself as a Welcoming City and accept a Strategic Welcoming Plan to guide the city’s efforts in the economic inclusion and social integration of immigrants” until 2021.

Dallas received a Gateways for Growth Challenge award in 2017 that included a research report on immigrants’ contributions to the Dallas economy and support for its strategic planning process. Highlights from the research include:

  • Immigrants households in Dallas earned $7.9B in 2016 and contributed over $2B in federal, state and local taxes that year.
  • Immigrants account for nearly one-third of the city’s entrepreneurs and generated nearly $500M in business income in 2016.
  • The DACA-eligible population in Dallas contributed $161 in taxes and held nearly $700 million in spending power in 2016.

(© Copyright 2019 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)