Police say they believe the crash was intentional but terrorism has been ruled out.
The car left the northbound lane of Las Vegas Boulevard and mounted the sidewalk twice at about 6:30pm local time on December 20.
The female driver, aged in her 20s, fled the scene but was later arrested.
The woman has been tested for alcohol and drugs.
A three-year-old child was found unhurt inside the car when police tracked it down.
“At this point we are treating this as an intentional act,” said Capt. Dan McGrath of the Las Vegas police.
Earlier, another police captain told reporters it was not an act of terrorism.
The person killed was an adult but witnesses say those hit by the car also include children.
Seven people were in a critical condition, according to officials.
The Miss Universe beauty pageant was being held in a nearby hotel at the time of the crash.
The vehicle appeared to be travelling between 30-40mph as it hit pedestrians, according to one witness.
Las Vegas’ famed Strip has been closed and sealed off as police investigate.
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