The only study more dubious would be one detailing the murder rates in uncontacted tribes from 1870-2014.
I appreciate the intention: polar bears aren't man eating monsters, but the remote nature of life in the Arctic gives me serious doubts on the accuracy of those findings.
I'd be open to the idea that his partner was murdered by some scorned investors, but the boat capsizing during a sudden a storm, in large part because it's dipshit owner wanted to brag about having the world's largest mast...well that would be a stretch even for Jason Bourne.
However, I would absolutely believe that there was a hit man waiting for him to return to shore, who had to explain to his client that there's no refunds just because God killed him first.