Boise police said Bruce Marchant, whose last known address is Boise, has been charged with murder, rape and kidnapping.
Sierra, who went missing in late September, was found dead at an outdoor location south of Idaho City on October 22. She was 18 years old.
The Boise County coroner said Thursday that Sierra’s death has been ruled a homicide, and that she died from some type of asphyxiation.
A first-year Boise State engineering student in the Honors College, Sierra – also known to many as “Simon” – was involved in a wide array of activities and clubs on campus.
Boise police said an arrest warrant was issued for Marchant on Tuesday.
On Wednesday, they received information that