ICE agent's family files wrongful death claim against Justice Dept.
In an interview last November, Zapata's family told CBS News they feel that U.S. law enforcement could have stopped the sale of a gun used to kill their son. CBS News obtained law enforcement records that show the gun that killed Zapata came from the U.S., and the suspects who allegedly trafficked it had been under law enforcement's watch for months in Dallas but weren't arrested.
In February, CBS News learned a second weapon used in the Zapata attack was also linked to an ongoing case under the Bureau of Alcohol, Tobacco and Firearms.
The Justice Department has said ATF "was not aware of" the suspect's purchase of the gun that killed Zapata when it happened, and that answering further questions would jeopardize the investigation.
Related: Second gun used in ICE agent murder linked to ATF undercover operation
Murdered U.S. agent's family wants answers
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