On Thursday, the sheriff's office released a sketch of a possible suspect. She was reportedly riding in the auto with her mother and three siblings when the gunman fired several shots into the vehicle.
"Investigators have been working tirelessly", he said.
'He intentionally killed my child for no reason, ' she said through tears.
Washington's other two daughters, 6 and 13, were also in the auto.
On Friday police said the sketch has led to "many potential leads" that are now being investigated.
Her favorite song was "Wake up in the Sky" by Bruno Mars, Gucci Mane and Kodak Black, Washington said.
Asked what she'll miss most about Jazmine, Alxis said, "Her smile". Washington told CNN that she did nothing to provoke the shooter. We must say this, acknowledge this and prosecute the suspect as such. They sped off in front of us and the truck slowed down and continued to fire as he was in front of us.
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Alxis said her little sister was always "bossing people around".
The killing of the seven-year-old has drawn national attention, including that of celebrities.
The sheriff has said the family didn't appear to do anything to incite the truck's driver.
"So, whatever the motivation may be for someone to be able to call in with that tip and get some extra money we are all for it", Gonzalez said Wednesday.
"Our goal is finding this individual, this coward, this shooter and finding this vehicle", said Gonzalez.
"It's a whodunit right now", Gonzalez said.
Washington thanked the community for an outpouring of support. "It could have been anybody in that position on this team.anybody in this city.It's unfortunate", Hopkins told ABC affiliate station KTRK-TV in Houston.
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It bears repeating that this game is taking place in Arlington, TX, where the Cowboys were 7-1 this season. The highest NFC seed remaining after the Wild Card round will play the Los Angeles Rams on January 12th.
Social activist Shaun King has announced a $100,000 reward is being offered for info that leads to the arrest of the killer.
Jazmine's mother LaPorsha Washington said the gunman looked "sick".
"His conscience is finally going to get to him after he sees my child's face go across (television screens) so many times".
Jazmine would have turned eight years old next month.
Gonzalez said at the news conference that his investigators are not focused on whether Jazmine's killing was a racially motivated hate crime.
Cops also released a short surveillance video from a nearby business of the killer in his red pickup truck shortly before the shooting, asking for people who recognize the vehicle to come forward.
Christopher Cevilla, Jazmine's father, said that he is confident his daughter's killer will be brought to justice, and he won't allow the case to go cold.
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"I just want anybody, whoever, out there that knows anything about the murder of my daughter, to just please step up as if it was your own", Cevilla told reporters.