What Killed Creighton McGregor?

Creighton McGregor's immediate cause of death was an aneuyrsm. At only fifty years of age, he was relatively young to have passed, and while it was certainly possible that the offending blood vessel was congenitally destined to give out well before Creighton reached old age, the fact that he was the youngest of four siblings, all seemingly in decent health, and that he was, more importantly, a severe alcoholic, did not lend itself well to the notion that Creighton's sudden, fatal, collapse was simply the result of a bum artery. After years, decades, in fact, of heavy drinking, it was more likely that he had let his body down and, as a result, allowed his system to become fatally vulnerable.

And what of his alcoholism? If, in the face of many years of excessive drinking, the idea of Creighton's deadly aneuyrsm occurring as the result of just a bit of bad internal hardware could be plausibly dismissed, what of his addiction to alcohol itself? Might that be nothing more than a genetic weakness for, say, Scotch, which was Creighton's preferred substance when seeking transit from sobriety? This was, of course, unknowable, and yet there were clues that suggested such a tidy and benign explanation left more than a little to be desired.