The National Park Service asked the Marin County Sheriff's Office to investigate the death, sheriff's Lt. Jamie Scardina said. According to reports, Hopfe showed signs of physical injury, although the sheriff's office said she had not been shot.
Results from an autopsy performed June 7 have not been released and toxicology results are pending. Hopfe was identified by fingerprints.
The sheriff's office is interviewing witnesses to determine a motive; there is no suspect or suspect description at this time, Scardina said.
Hopfe attended Amador Valley and Village high schools. She also lived in San Ramon and Hayward. She is survived by two children, her parents and three siblings; her father was a Hayward police officer.
Anyone with information is asked to call the sheriff's office at (415) 473-7265.
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