Prosecutors say the girl was sharing a seat belt with a sibling when she was thrown from the SUV on Interstate 17.
PHOENIX, Ariz. — An Arizona mother was jailed after prosecutors accused her of speeding and weaving through traffic on Interstate 17 before a rollover crash killed her 9-year-old daughter and injured three other children riding with them in north Phoenix on Sunday morning.
The case moved quickly from a highway fatality to a child death prosecution. Authorities arrested Brenda Liliana Rivera Estrada, 30, after she was released from a hospital and booked her on one manslaughter count and four child abuse counts. Prosecutors say the girl had been sharing a seat belt with one of her siblings when she was thrown from the SUV. The criminal case now turns on whether investigators can prove reckless driving, unsafe restraint choices and any role impairment may have played.
Troopers were sent to northbound I-17 near Peoria Avenue at about 7:30 a.m. on April 12 after a single SUV rolled over, according to public accounts of the crash. Rivera Estrada was driving with four children in the vehicle, a 1-year-old girl, a 3-year-old boy, an 11-year-old boy and a 9-year-old girl. By the time emergency crews reached the scene, the 9-year-old had been ejected and pronounced dead. The mother and the other three children were taken to a hospital with serious injuries. Authorities later said the surviving children were treated and released. The wreck shut down northbound lanes of the freeway for several hours, turning a stretch of Sunday morning traffic into an extended investigation scene. At Rivera Estrada’s first court appearance the next day, a prosecutor said witnesses saw the SUV “driving above the posted speed limit” before it rolled.
Prosecutors added more detail at that Monday hearing. The speed limit on that part of I-17 was 65, the prosecutor told the judge, and multiple witnesses said Rivera Estrada was passing vehicles and “driving recklessly.” Troopers also reported an odor of marijuana coming from the SUV after the crash. In court, the prosecutor said Rivera Estrada told investigators she had smoked marijuana at 6 a.m. on April 11, the day before the crash. Rivera Estrada disputed the impairment claim in open court, saying, “I was not high.” That exchange set up one of the central disputes in the case only a day after the rollover. As of Wednesday, no toxicology results had been publicly released, and investigators had not publicly described any mechanical failure, road hazard or medical emergency that might also explain why the SUV rolled. Officials have described what witnesses saw before the crash, but they have not yet publicly laid out the exact physical cause of the rollover itself.
Authorities did not initially identify the girl who died, but relatives and a public fundraiser later named her as Alexa Cortez Rivera. The same public reports identified Rivera Estrada as the mother of all four children in the SUV. That moved the story from a freeway crash report to a family tragedy almost at once. Online tributes described Alexa as affectionate and funny, and the fundraiser said she had a full life ahead of her before the crash cut it short. Officials, though, have stayed focused on the charging decision and have released only a narrow set of facts. They have not publicly said where each child was seated, whether child seats or boosters were present, or whether the 9-year-old was made to share a belt because the vehicle lacked enough proper restraints. Those details could matter later because prosecutors must do more than show a terrible outcome. They must connect any safety failure or reckless choice to the child abuse counts they filed.
Arizona law requires young children to be secured in a child restraint system and requires drivers to make sure passengers under 16 are properly buckled while a vehicle is moving. In this case, prosecutors are accusing Rivera Estrada of something far more serious than a traffic infraction. They say one child was made to ride using the same seat belt as another child, a setup that investigators say ended with the 9-year-old being thrown from the SUV during the rollover. That allegation sits at the heart of the criminal case, alongside claims of speeding and possible drug use. It also helps explain why officials have stressed the children’s ages, one, three, nine and 11, in nearly every public update. Age affects both how children should be restrained and how a jury may later judge an adult’s decisions before a crash. A case that began with an overturned vehicle on the freeway now reaches into questions of parenting, judgment and criminal responsibility.
Rivera Estrada was booked into the Maricopa County Jail after her hospital release, and a judge set her bond at $100,000 during Monday’s first appearance. The judge called the case “just a tragedy,” a remark that captured the tone of the hearing without settling the legal issues ahead. Those issues remain substantial. Prosecutors will need crash reconstruction, witness interviews and any toxicology results before the case is fully tested in court. Defense arguments are also easy to see from the still-thin public record: the crash was a single-vehicle rollover, the exact trigger has not been publicly explained, and Rivera Estrada denied that she was impaired when she drove. Public reports available Wednesday did not identify a later hearing date, a grand jury action or any new filing beyond the initial charges. That leaves the public story in an early stage, with the most emotional facts already known but many of the most important legal facts still to come.
Even with those gaps, the outline of the morning is stark. A Sunday drive on a major Phoenix freeway ended with an SUV on its roof, one child dead, three siblings hurt and a mother taken from a hospital bed to jail. The northbound lanes of I-17 stayed closed for hours as troopers worked the scene and the rest of the city moved around them. Video from the crash scene showed the overturned vehicle and the broad stretch of freeway where the children had been riding moments before. Family messages later added another layer of grief. One online tribute said Alexa would be deeply missed, while the fundraiser described a child whose death shattered relatives in a single morning. Those public expressions do not answer the criminal questions prosecutors now have to prove. But they show what the bond amount, charging counts and brief police statements can hide. This case is not only about alleged recklessness on a freeway. It is also about the collapse of one family inside a vehicle carrying four children at once.
By Wednesday, Rivera Estrada remained charged with manslaughter and four counts of child abuse, and investigators had not released a fuller account of what caused the SUV to roll. The next clear milestone will come when prosecutors file more detailed court papers or a judge sets the next hearing date.
Author note: Last updated April 15, 2026.