Transcript for 16-year-old girl accused of killing Uber driver

Right now we turn to that Uber incident, a 16-year-old girl in custody accused of killing her driver. Mara schiavocampo here with that story. Good morning. Mara. Reporter: Good morning, it's a shocking crime. Prosecutors say a 16-year-old girl, your typical high school student typically brutally murdering her Uber driver. The suspect is not talking now facing charges as an adult being held without bail. This morning, an Illinois teen facing murder charges for what officials are calling a brutal and unprovoked attack on an Uber driver. 16-year-old Eliza wasni appearing in court after prosecutors say she attacked her Uber driver with a knife and machete early Tuesday for no apparent reason at all. Fatally wounding 34-year-old driver grant Nelson. Only two minutes or so after picking up the defendant, she begins to hack at him and stab him from the back of the seats. Reporter: Prosecutors say wasni called for an Uber pickup at this Walmart just outside Chicago around 3:15 Tuesday morning after allegedly stealing a knife and machete. Surveillance video showing her leaving the store without paying for the items. After allegingly turning the weapons on her driver, he managed to escape running to a nearby apartment building for help. It was just help me, god help me please. I'm going to die. At the top of his lungs. Reporter: Officials say wasni tried to flee and Nelson's Hyundai sonata but the high school student crashed the car and ran off on foot before police say they found her hiding behind a nearby building wearing only leggings and her bra, still holding the machete and knife. Police saying they had to tase her to drop the weapons. Nelson was rushed to the hospital but hours later died from his injuries. Now his family is remembering him as a gentle man hoping for justice. This is a time of hart heartbreak and tremendous loss. Reporter: In a statement Uber says we are heartbroken by one of our partners grant Nelson. Our beepest sympathies and prayers are with his family and loved ones during this difficult time. Baffling crime. No motive? We reached out to her attorney and did not get a response but prosecutors say this appears to be random. Did not appear to know the vic and learning a lot about what she did. This was her third Uber ride of the morning, 16-year-old out at 1:00 and 2:00 in the morning and stole these from Walmart and got them that night and surveillance video shows her walking around casually walking out of the story and calling the Uber. Two minutes after getting into the car and the family of this man, Mr. Nelson, they're saying he was working two jobs, he lived with his family, really gentle soul and he's being remembered that way this morning. Just horrible. Okay, Mara, thanks very much.

This transcript has been automatically generated and may not be 100% accurate.