One report says the Kingair underwent some level of maintenance only 5 or 6 hrs prior to the fatal flight. Could there be a clue here?
I've know I've seen an article that stated if you are going to have mechanical failure, it will be within a short time after the wrench-benders have been at it.
Not putting any particular blame on wrench operators overall, I personally believe they are 99.99% hard-working and conscientious people - but we are talking human intervention in the nuts and bolts of a machine, and with that, comes the possibility of human error.
I have never forgotten the story of the mission aircraft in PNG that went down with all hands due to an in-flight engine fire - and it was caused by the engineer failing to properly tighten a fuel fitting, because he was distracted by a phone call in the middle of tightening the fuel line.