A grand jury has indicted Aaron Saucedo on a number of charges, including eight counts of first degree murder, according to court paperwork.

Saucedo, 23, was also indicted on the following charges:

• Six counts of drive by shooting

• Two counts of attempted first degree murder

• Two counts aggravated assault

• One count discharging a weapon into a building

• One county of endangerment

Saucedo proclaimed during a court hearing a month ago that he was innocent.

The attacks terrified people living in the Maryvale neighborhood of Phoenix, a mostly Latino community where all but two of the killings occurred. Residents stayed indoors at night amid the height of the fear over the killings last summer.

Phoenix police arrested Saucedo on May 8 in connection to a string of shootings from 2016.

At the time of his arrest for the Serial Street Shootings, Saucedo was already in custody for a 2015 homicide. He pleaded not guilty to that charge.

RELATED: Who is the Serial Street Shootings suspect?

Police first contacted Saucedo into December 2016 as a person of interest in the string of crimes.

Ultimately, investigators used evidence collected at the scene and a casing found in 2001 Series BMW at Saucedo's home to tie him to the Serial Street Shootings.

The Associated Press contributed to this report.