Officially, no. Taking a few leaps and taking into account what Pavel Yarmolenko said Sunday, yes.
I speculate that investigators have developed, or are developing, forensic evidence from the crime scene and the vehicle, which was found on the banks of the Catawba River. What’s more Pavel Yarmolenko seems very confident that his sister did not have any kind of domestic dispute that could’ve have escalated into violence. This points in the direction of a stranger abduction.
