Rachel Castillo was reported missing after her sister found a bloody scene at her Simi Valley home on Nov. 10.
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The discovery triggered a search for the 25-year-old woman, whose cellphone, car keys and vehicle were still at the home she shared with her sister Emily.
On Sunday, Simi Valley detectives say they found human remains in a remote location of the Antelope Valley. The medical examiner identified the remains as Rachel Castillo.
Detectives arrested Rachel Castillo's ex-husband, Zarbab Ali, a 25-year-old Hawthorne resident. He was arrested at his parents' home in Victorville "in connection to Rachel's homicide."
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Family members and friends held a vigil early Sunday evening to honor Rachel and seek the public's help for what was then considered a missing-person case. It appears at the time they were not aware of the new developments in the case.
Police have not released additional details.
DEVELOPING: This story will be updated as more information becomes available.
The video in the media player above is from an earlier report on this story.