Authorities positively identified the body of a woman found in a car at the bottom of the Fox River as that of a Green Bay student missing since July 13, according to the Brown County medical examiner.

An autopsy positively identified 21-year-old Mahalia Xiong, Capt. Karl Fleury said at a news conference.

"There is no sign of foul play," Fleury said. "She was still dressed in the clothing she was wearing the night she went missing. Inside the vehicle, we found her purse."

Xiong's cause of death was still under investigation and officials were awaiting the results of toxicology tests to determine her blood-alcohol level, said. She had been drinking the night she vanished, investigators have said.

She was last seen by friends July 13 leaving the parking lot of the Ashwaubenon bowling alley after a night of drinking.

A Green Bay police officer spotted tire tracks yesterday leading into the water on the Fox River's west bank. That prompted a search of the river and Xiong's rental car was found submerged.

According to Fleury, it was believed Xiong was heading to her sister's home on the east side of the Fox River on the night she disappeared is likely the night she went into the water. Foul play is not suspected in her death.

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Investigators hope to recover from the car's computers information that can shed more light on the timing of the plunge into the river and how fast the car might have been traveling, he said.

"It was found 95 feet away from the shore. That tells us potentially there is some speed involved," Fleury said.

Police have been keeping close contact with the Xiong family, according to Commander of Investigations Thomas Molitor.

"The family is very upset. But at some level this is closure for them," he said.

FOXNews.com's Adam Riback and The Associated Press contributed to this story.