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A 16-year-old girl allegedly hacked to death her Uber driver with a stolen machete and knife.

Eliza Wasni "nonchalantly" walked out of a supermarket with the blades before climbing into 34-year-old Grant Nelson's car, which she had hailed in the early hours of Tuesday morning, it is claimed.

She then stabbed him from the backseat as he drove before climbing behind the blood-splattered wheel and driving off herself after he fled, a court heard.

Nelson ran to a nearby apartment block screaming "help me, help me, I'm going to die". He was able to give the police a description of his killer before dying of his wounds.

Prosecutors offered no motivation for the attack at a court hearing on Wednesday, when Wasni was remanded in custody after being charged as an adult with first-degree murder.

Court papers described the teen, from Chicago, Illinois, as a calm girl seen "nonchalantly" walking through the suburban Walmart store with the knives in hand before leaving without paying.

Nelson picked the girl up shortly after 3am. It was her third ride in an Uber vehicle in the early morning hours of Tuesday.

Two minutes after he began driving, Wasni allegedly began stabbing Nelson from the back seat. He was able to pull over and run into a nearby apartment building, where residents called 911.

Wasni climbed into the front seat of Nelson's silver sedan and drove away before striking a central reservation in the road. She jumped out of the car and fled on foot, the court was told

When police arrived they found the car splattered with blood with Nelson's phone open to the Uber app, which said his passenger had been named Eliza.

Officers followed the trail of blood and found Nelson lying in grass. He was bleeding heavily from several wounds but was able to tell the officers what had happened. He died at a nearby hospital a few hours later.

Police found Wasni nearby crouching behind an air conditioner with a machete in one hand and a knife in the other, the court heard.

Officers shot her with a Taser after she allegedly ignored orders to drop her weapons.

According to prosecutors, police recovered a shirt the girl could be seen wearing in the Walmart. The shirt had blood on it when it was found.

Uber said the company was working with police to help the investigation.

It said in a statement: "We are heartbroken by the loss of one of our partners. Our deepest sympathies and prayers are with his family and loved ones during this incredibly difficult time."

Nelson's sister Alex told Chicago broadcaster WMAQ-TV her brother was a good person.

She said: "He was not a vindictive person. He was not a cruel person. He didn't deserve this fate."