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Aaron Saucedo, 28, was arrested in April 2017 in connection with serial street shootings that began in August 2015 and ended in July 2016.
Authorities said Saucedo, a former Phoenix bus driver, was allegedly linked to 12 separate shootings that left nine people dead and three injured, mostly in a largely Latino neighborhood in west Phoenix.
The victims were Black women and young Hispanic men and all but one were randomly shot, according to prosecutors who are seeking the death penalty.
Saucedo is facing charges of first-degree murder, drive-by shooting, attempted murder, aggravated assault, discharging a firearm at a non-residence, endangerment, and discharging a firearm at a residence.
Prosecutors allege Saucedo targeted victims after dark and shot them as they stood outside their homes or sat in cars.
Saucedo's trial was originally scheduled for 2019 and has been pushed back three times.
Maricopa County Attorney Rachel Mitchell said the start of the trial is taking so long because there are so many witnesses and victims involved.
Saucedo’s attorneys said more than 200 witnesses needed to be interviewed in the complex case that also was hampered by the impact of the COVID-19 pandemic.