Based on the pathologist's finding, the teen's death was the result of drowning and there was no other information to suggest she was the victim of foul play.
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RELATED: Mom, friend of missing teen Kiely Rodni recall last conversations before she vanished
Rodni was last seen alive Aug. 6 at a party of hundreds of youth at a campground at Prosser Reservoir in Tahoe National Forest, about 165 miles (266 kilometers) northeast of San Francisco.
Her disappearance triggered a huge search by multiple law enforcement agencies over two weeks, including underwater searches of the reservoir by dive teams.
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The Associated Press contributed to this report.