Homeland Security Secretary Kristi Noem initially disclosed the change, stating her department would cooperate fully with the FBI's probe to ensure transparency.
Noem appeared to retract earlier statements claiming Pretti brandished a handgun, acknowledging that initial information was relayed from agents on the ground.
Videos of the shooting show Pretti holding only his mobile phone, with an officer removing a handgun from his waistband before shots were fired into his back.
Separately, earlier videos emerged showing Pretti in an altercation with federal immigration officers 11 days prior, which Donald Trump commented on, suggesting it undercut the narrative of Pretti as a peaceful protester.
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