DALLAS — A second immigrant has died after being shot in an attack at a U.S. Immigration and Customs Enforcement field office in Dallas, his family said.

Miguel Ángel García, 32, died early Tuesday after being removed from life support, according to the League of United Latin American Citizens, a civil rights organization supporting the family. He had been in critical condition since a gunman opened fire at ICE’s field office last week in an attack that federal investigators said was intended to target immigration officers.

All of those shot were detainees in a transport van. Mr. García — an undocumented immigrant whose wife is expecting their fifth child — was shot several times, his family said. Norlan Guzman Fuentes, 37, of El Salvador, was also shot and killed. A third man, from Vene

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