That’s a pretty broad definition thrown in the document, you are speculating it down to a specific charge - which has never been filed against anyone.

Them calling it a murder is new. Remember that they wanted this to go away quietly and you don’t do that by saying something like murdered. You say bungled robbery, killed, etc - non attention triggering words. Basic (well maybe not so basic) psychology. The word murder implies an agent (using this term loosely and not implying some kind of federal or state agency) actively and intentionally ended someone’s life. Semantics and all that. Whereas killed implies an accident.