Police say Saucedo killed nine people and carried out 12 shootings from August 2015 and July 2016, targeting victims after dark and gunning them down as they stood outside their homes or sat in their cars.
Saucedo faces the possibility of more than two dozen criminal charges, including murder, attempted murder and aggravated assault, Williams said.
They believed he was responsible for nine ambushes that killed seven people, including a 12-year-old girl, and put the city on edge.
The shooter stalked victims after dark, police have said, picking victims who were either outside of their homes or sitting in cars.
The so-called Serial Shooters randomly targeted pedestrians; Dale Hausner killed himself while in prison, and Samuel Dieteman is serving a life sentence.
"The tips that came in were not so specific that it had to come from someone who knew the whole case - they were general and vague in nature, but they were enough to push us in the right direction", Howard says.
Saucedo was arrested in April in connection with the shooting death of 61-year-old Raul Romero, who was the boyfriend of Saucedo's mother and held on $750,000 bail. They received around 3,300 tips, Phoenix Mayor Greg Stanton said, one of which led to the identification of Saucedo as the serial shooting suspect.
"If they would have looked more into it, looked closer to home, it would have prevented a lot of other deaths", said Lydia Lopez, whose son Jesse Olivas, died on New Year's Day 2016 in the neighborhood.
Authorities say they don't know the motive behind the shootings. He killed Manny Castro Garcia on June 10, 2016, police said.
Police have identified new victims in a series of Phoenix shootings that resulted in the arrest of a 23-year-old man.
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Police said the killings were unrelated to a series of 2015 freeway shootings in Phoenix that terrified drivers.
Police arrested Saucdeo in that case after finding a pistol he'd sold at a pawn shop and matching it to evidence found at the crime scene, court documents said.
Few details have been released on how Saucedo was tied to the killings, although police have said evidence against him includes surveillance video, witness statements and ballistics material.
Saucedo is also implicated in the non-fatal shooting of two teenage boys on March 17, 2016.
A 21-year-old male shot standing near his auto on the street at 11:30 p.m. on March 18, 2016.
April 1, 2016: A 21-year-old man, Diego Verdugo-Sanchez, was shot and killed in front of a home around 9 p.m.
"I'm happy my kids are going to be able to walk outside and I won't have to fear that they're going to get shot", Pastrana said.
"When they showed me the picture, I did get a little chills", he said.
Smith was pregnant with the couple's child when Verdugo-Sanchez was fatally shot.