Ms. Petito, 22, died three to four weeks before her body was found Sept. 19 near an undeveloped campground along the border of Grand Teton National Park in remote northern Wyoming, Teton County Coroner Dr. Brent Blue said at a news conference yesterday.
It was not clear whether the determination could lead to further charges against Mrs Petito’s boyfriend and travel partner, Brian Laundrie, who is considered a person of interest for her disappearance and remains unaccounted for.
Her body has been forwarded to a crematorium for cremation.
Mrs. Petito had been on a cross-country trip with her boyfriend.
She was reported missing on September 11 by her parents after she did not respond to calls and text messages for several days while the couple visited parks in the West.
Mrs Petito and Mr Laundrie posted online about their journey in a white Ford Transit van that was converted into a motorhome.
No charges were filed and no serious injuries were reported.
Investigators have searched for Mr. Laundrie in Florida and also searched his parents’ home in North Port, about 56 miles south of Sarasota.
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Federal officials in Wyoming last month accused Mr. Laundrie of unauthorized use of a debit card, alleging that he used a Capital One Bank card and a person’s personal identification number to make unauthorized withdrawals or fees worth more than $ 1360 ( $ US1000) during the period in which Mrs Petito disappeared.