The image of the red, four-door pickup was captured shortly before the shooting occurred Sunday morning, Harris County sheriff's Lt. Christopher Sandoval told reporters.
Sheriff Ed Gonzalez declined to speculate on what prompted the driver of the pickup to pull alongside and fire into the car carrying Jazmine Barnes, three of her sisters and her mother.
Jazmine died at the scene, her mother suffered a gunshot wound to the arm and her 6-year-old sister was injured by shattered glass. The mother, 30-year-old LaPorsha Washington, remained in a hospital Monday.
Gonzalez described the shooting as "totally unprovoked."
"The family should be celebrating and spending time together anticipating the new year and instead they're making plans to bury this innocent, precious child," Gonzalez said.
A distraught Washington told KTRK-TV from her hospital bed that the gunman sped up after firing into her car, only to pull in front and slow down before firing again.
"He intentionally killed my child for no reason," she said. "He didn't even know her, he didn't know who she was."
Authorities initially said the shooting occurred as Washington was leaving a Walmart parking lot, but Gonzalez on Monday said it occurred on a nearby service road as the family was heading to a store.
The gunman was described as a bearded man in his 40s wearing a red hoodie.
"I hope with each passing moment his conscience is eating away at him," Gonzalez said, later adding, "Do the right thing and turn yourself in. There's no need for anyone else to be harmed."
Jazmine's father, Christopher Cevilla, who appeared with Gonzalez at Monday's news briefing, pleaded with the public to provide relevant tips to authorities so that an arrest can be made.
"My daughter was 7 years old, loving, caring, very passionate with people, very sweet, just an innocent young girl," Cevilla said. "Very smart in school. There's just a lot of things that's being robbed of me and my family at this moment that we will never be able to get back."
Investigators ask all residents in the Wallisville Rd/E. Sam Houston Pwky area to review security video from the morning of 12/30. Looking for a red 4-door pickup involved in the fatal shooting of Jazmine Barnes, age 7. Call 713-274-9100 or @CrimeStopHOU at 713-222-TIPS #hounews— HCSOTexas (@HCSOTexas) December 31, 2018
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