Detectives produced sketches based on statements provided by witnesses and survivors and police stumped up a $75,000 reward for information which might trace him but the killer went unstopped for more than a year.
Police say tips from the community resulted in his arrest. Weapons technicians concluded only a Hi-Point gun could produce the markings they found, the report went on to say.
After an investigation, however, police said they linked Saucedo, dubbed the "serial street shooter", to the random murders of eight others between August 2015 and July 2016.
The serial shooter that plagued the Phoenix area for four months in 2016 has been apprehended, according to allegations by Phoenix police.
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"Those tips led directly to where we are today", Stanton said. Saucedo is not believed to have personally known any of the victims, except for the first.
Authorities said they don't know of any motive for the shootings.
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Police credited the public with helping to solve the case, adding that 3,300 tips were made to a special crime hot line. Courtesy of ABC15 Arizona and YouTube.
All of the killings were random except for the first one, Ms Williams said. In 2015, a shooter struck 11 times along the state's freeways over two months.
"We have multiple guns that were used in these shootings", Howard tells PEOPLE. Officials indicated there is no evidence he had an accomplice in the shootings.
"[Police] said they couldn't give me a lot of details, as it's still an active case", Ellis said.
Two men were also arrested in 2006 for killing eight people and shooting at dozens of others over the course of a year.
June 12: Shots fired at an unoccupied vehicle at 6200 West Mariposa Drive.
Phoenix police announced Monday afternoon that 23-year-old Aaron Juan Saucedo was taken into custody in connection with the case that authorities said was the work of a serial killer.
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Investigators initially believed a serial shooter was responsible for seven deaths previous year, but in recent weeks they determined two other victims - the one killed in August 2015 and another person slain in January 2016 - were shot by the so-called "serial street shooter" who they believe to be Saucedo. He died at a hospital.
On 17 March, 2016, a 16-year-old boy was shot dead as he walked down the street at 11.30 pm.
On June 2, 32-year-old Horacio De Jesus Pena was shot while he stood outside a home shortly before 10pm.
Marina Smith, the partner of 21-year-old Diego Verdugo-Sanchez, who was gunned down on April 1, 2016, said she welcomed news of the arrest but was still struggling with his loss. He killed Manny Castro Garcia on June 10, 2016, police said.
Manuel Castro Garcia, 19, murdered outside his home on June 10, 2016.
On 12 June, Stefanie Ellis, 33, her daughter Maleah, 12, and family friend Angela Linner, 31, were shot as they listened to music in a vehicle. All three died of their injuries.
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The decision is the latest in a series of moves that could benefit polluters. It remains to be seen who will get appointed to the board.