The only qualms I have about it being professional are that I would expect more than one person in such a case.Photo suggests a brazen, meticulous, pre-planned, and perhaps even professional act to me!
With that outfit and those tools, there's no sexual assault or robbery motive here!
JMO.
This is reminding me of the Missy Bevers case. Except they left the body there, which to me is a huge difference.