Dan Gryder - probable cause - claims that the issue was simply overweight take off. Initially there were claims Jim landed, offloaded someone and took off with his passenger. Apparently the story is that two hunters were awaiting collection by Jim, along with a bear which they had killed. Jim loaded the bear and one of the two hunters, then attempted to take off but apparently without considering conditions and actual weight and balance.
If that's actually the case, I'm shocked because in Alaska, they have exemptions for flying 15% over MTOW in certain circumstances. I'm hoping that Dan is mistaken and Jim was faced with an underperforming engine or some loss of power on take off, rather than accept that someone like Jim can be brought down by poor prep in terms of weight and balance calculations.....