Pardon me, but the autopsy said evidence of a sexual assault was "inconclusive." Wherever you heard she was sodomized with a paint brush, it is most likely embellishment.
Who said anything about sodomy? The Medical Examiner from Phoenix was hired by the Boulder D.A. to review the forensic evidence and give them his opinion. Smart move by the new D.A. He found a sliver of wood in Jonbenets' vagina and matched it to a wooden paintbrush in the basement. He correctly deduced from this evidence that the butt end of the paint brush was used to symbolically rape Jonbenet, not uncommon with sexual predators. This caused the abrasions to her vaginal wall and was responsible for the blood found in her underwear. This M.E. was part of a panel of experts on the Nancy Grace show Wed. night.