Police dubbed Saucedo the "Serial Street Shooter" for a spate of shootings over a four-month period that left Phoenix residents terrified.
The trail seemed to have run cold, despite more than 3,300 tips to the Silent Witness program and the help of the Federal Bureau of Investigation.
The former bus driver's only other comment was to acknowledge that he understood the goal of the court appearance late Monday night. Police said Saucedo in fact did have a BMW but stopped driving it and changed his appearance after the final shooting. On Monday, he was booked on 26 additional felony counts, including in another slaying that hadn't previously been tied to the serial shooter.
The Maricopa County attorney, Bill Montgomery, said his office planned to review the evidence and evaluate which charges to pursue in order to prepare the strongest case possible against Saucedo.
"I know that when the right time comes for them to share more details, they will".
Police said the killings were unrelated to a series of 2015 freeway shootings in Phoenix that terrified drivers. The victim, Raul Romero, was killed in August 2015.
City, county and federal law enforcement officials put tens of thousands of hours into investigating the case and received approximately 3,300 tips, some of which led to Saucedo, said Sgt. Jon Howard, a Phoenix police spokesman.
"Our hearts go out to the surviving families", Phoenix police chief Jeri Williams said. Saucedo knew only the first victim, and the other killings were random, authorities said.
Saucedo was arrested last month in connection with the August 2015 fatal shooting of a man who had a relationship with his mother, 61-year-old Raul Romero.
Detectives produced sketches based on statements provided by witnesses and survivors with police at one stage having offered a $75,000 reward for information which might trace him but the killer went unstopped for more than a year.
Saucedo is already in jail facing one murder charge and appeared at the hearing handcuffed and dressed in black-and-white striped prison garb.
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Tips from the public led to Saucedo being linked to last year's killings, Williams said.
In the end, nine people were killed in 12 separate shootings.
Lydia Lopez, the mother of Jesse Olivas, said she suspected her son's death was connected to the Serial Street Shooter.
Castro Garcia, 19, was killed on June 10, 2016.
"For one part I'm happy because there's going to be justice in my son's death and others' deaths and that person is not gonna do more damage".
"But my son is not coming back", Ms Castro said. Every day I would just pass by and touch it and pray, "Lord get him. The pain is the same". She said he was never a trouble-maker and preferred playing basketball with friends over partying. "Today we are closer to providing them the justice they deserve".
" 'I had a gut feeling it was him, ' she told paper on Monday".
April 1, 2016: A 21-year-old man, Diego Verdugo-Sanchez, was shot and killed in front of a home around 9 p.m.
Smith was seven months pregnant with the couple's child when Verdugo-Sanchez was fatally shot in front of a home.
She said she had grown frustrated about being kept in the dark about the investigation.
They found a gun that he had pawned in September 2015 and matched it to evidence from the murder of Romero, 61, who was gunned down outside his home but had not been included in the pattern identified by police.