Duran was being held on a parole violation, but Hahn said he expected multiple charges of attempted murder would be added.
Duran's aunt told the Sacramento Bee they did not believe he fired the shots that struck the federal agent and that the police response to the incident was excessive.
"This is out of proportion — (Duran's) a parolee," Donna Sandoval said. "My nephew isn't a murderer for all this ... to happen. They shot first at my house."
State corrections officials told The Associated Press that Duran has a record stretching back to at least 2002, when he was convicted of possessing a controlled substance. In 2009, he was sentenced to four years for assault with a deadly weapon, resisting arrest and attempted carjacking.
Records show he was paroled last in April, but that the parole was revoked in July.