Authorities want to talk to the person in the red pickup to get his account of the crime, Gonzalez said. The shooting occurred as the family was heading to the store.
The case caused widespread outrage and celebrities joined an appeal to find Jazmine's killer using the hashtag #JusticeForJazmine.
Sheriff Ed Gonzalez said a second individual has been linked to the slaying but didn't name him during an afternoon news conference.
Law enforcement is still on the hunt for the shooter who killed 7-year-old Jazmine Barnes on Sunday (Dec. 30, 2018).
According to Houston ABC affiliate KTRK, the 20-year-old Black confessed to playing a role in the December 30 shooting, on Saturday night after a tip lead Harris County investigators to his arrest.
Jazmine was killed after a gunman fired into the auto that she was riding in with her mother and siblings at around 6:50 a.m. Sunday, officials said. Police say they identified the suspect based on a tip that was corroborated by their investigation.More news: Samsung to Add iTunes Movies App to Its Smart TVs
Black was driving a rental vehicle of unknown description and not a red pickup truck as originally thought by investigators, according to the complaint.
But Black, who appeared in court Sunday, is black. Prosecutors said the 9mm handgun they believe was used in the shooting had been recovered from Black's home.
Fox 26 reports the alleged shooter is black, not white, and also that the shooting may have been gang-related.
Gonzalez retweeted posts as recently as Saturday of a composite sketch of a white man who was initially sought as a suspect in the case.
Black says he thought it was a auto he had seen the night before, he didn't realize who was inside. They've worked on several cases together over the years, including the killing of Antwon Rose II, a black teenager killed by police outside Pittsburgh in June.
20, was arrested Saturday during a traffic stop for marijuana possession, Texas authorities said.More news: Chance the Rapper Says Working with R. Kelly Was a "Mistake"
"At the same time, it was a major shock to the family", Merritt told CNN on Sunday morning. "However, all the information up until yesterday has been that the shooter was an older white male in a red truck".
Black was charged a few hours after the Sheriff's Office announced that its investigation had "taken a new direction".
Now authorities say the gunman may have been trying to shoot someone else.
Prosecutors said he admitted driving the vehicle while an accomplice opened fire in what may be a case of mistaken identity. Officials stated that "all evidence gathered so far in the Jazmine Barnes Homicide case supports investigators' strong belief that she and her family were innocent victims".
On the morning of Jazmine's death, she and her sisters were still in their pajamas as their mom drove to Joe V's Smart Shop to get supplies for breakfast. The family was stopped at a traffic light when their auto was opened fire on without apparent warning or provocation.More news: Firm unveils upgraded Micro LED displays that can fit any room