Maricopa County Sheriff's Office

Aaron Saucedo.

Police have accused Aaron Saucedo of being the "Serial Street Shooter," but prosecutors have not filed charges against him.

Indictments usually happen one of two ways. They either come through a preliminary hearing where a judge decides if there is enough probable cause, or through evidence prosecutors present to a grand jury.

Prosecutors don’t have to rush because Saucedo is already in custody for a separate murder, said Scott Halverson, a trial attorney who is not involved in the "Serial Street Shooter" case.

“I think there is certainly no sense of urgency at this point, especially in light of what happened with the 'Freeway Shooter,'” Halverson said. “They want to make sure they have everything lined up as best they can and they do a thorough job in their investigation.”

Court documents show Juan Martinez as the deputy county attorney for the "Serial Street Shooter" case. Martinez prosecuted Jodi Arias. Though he twice failed to convince a jury to give Arias the death penalty, Martinez’s efforts made him a household name among courtroom observers.

Halverson has sat on the opposite side of the courtroom from Martinez.

“He’s a worthy opponent for any criminal defense attorney,” Halverson said. “There is no question about that. He is very experienced. He seems to be now their go-to guy for high-profile cases.”

Prosecutors have said their investigation into Saucedo is ongoing. The statute of limitations for most felonies is seven years, but it does not apply to murder cases, Halverson said.