Copyright by WAVY - All rights reserved Brianna Armstrong (Credit: Facebook)

Copyright by WAVY - All rights reserved Brianna Armstrong (Credit: Facebook)

VIRGINIA BEACH, Va. (WAVY) - Nearly three months after the discovery of her body, the Medical Examiner has completed the autopsy on Brianna Armstrong.

Armstrong died of decapitation, dismemberment and post-mortem mutilation, according to the Norfolk Office of the Chief Medical Examiner.

She was last seen alive May 7. A missing person report was filed in Virginia Beach two days later and her remains were found a month later at the Great Dismal Swamp in Chesapeake.

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Justin Cornell, Armstrong's co-worker, is accused of killing her. At a June court hearing, prosecutors said during a search of Cornell's Virginia Beach home, detectives found the same kind of trash bags used to conceal Armstrong's body. Detectives said they also found blood in his apartment.

Cornell was back in court September 3 for a bond hearing. He was denied bond. His preliminary hearing is scheduled for October 15.