The family of a Mexican man shot last week at an immigration and customs facility in Dallas say he's died, becoming the second detainee to be killed in the attack.
Police previously said one person was killed and two critically injured after a gunman opened fire at an ICE field office in the Texas city last Wednesday.
The head of the FBI said in the aftermath that a handwritten note recovered from the scene detailed the suspect's desire to inflict "real terror" on US immigration agents.
A bullet engraved with the phrase "ANTI-ICE" was also found, the FBI said, with the attack being investigated as an act of "targeted violence".
Miguel Angel Garcia-Hernandez, 32, was the latest to succumb to his injuries after being removed from life support, his family confirmed in a statement shared by the League of United Latin American Citizens.
He is understood to have been one of the two detainees left in a critical condition following the attack on 24 September.
Officials previously said the first man killed was Norlan Guzman-Fuentes.
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