Kharon Mays faces nine counts of felonious assault, one count of discharging a firearm on or near prohibited premises and one count of having weapons under disability.
In an email to WCPO early Monday, Mays claimed he wasn't involved.
He is scheduled for a court hearing at 8:30 a.m. Friday.
A victim, Jamie Arnold, said she had just dropped off her mom at home after a birthday party and grocery run. There had been a fight outside Gateway Plaza, and Arnold unknowingly pulled into a shootout.
Arnold, who posted a dramatic video of the incident, said three bullets blew out her rear window, shredded her seat and hit her arm and shoulder.
Fortunately, they missed the five young children in the car, who were between ages 3 and 10.
One bullet also hit a window at Cincinnati City Hall, according to a police report.
Another suspect, Raesean Jackson, was arrested late last month. He also faces nine counts of felonious assault and a count of discharging a firearm on or near prohibited premises.
Police said Jackson, 20, was trying to hit someone in another car near Ninth Street and Central Avenue when he shot Arnold instead.
A grand jury indicted both men July 5, but Mays wasn't booked into jail until early Tuesday.