According to OSHA, slips, trips and falls comprise the second leading cause of accidental death (with motor vehicle accidents being the first). On average, 15,000 Americans will slip, trip or fall to their death in any given year.
So, yes, it's a quite common way to accidentally kill yourself.
LOL. How many of those were from being shoved over a stair railing.
But on average, will two British Nuclear Scientiest fall to their deaths in the same building within four months?
Get with your actuary on this one, will wait for your report.
The great majority of those are elderly or very drunk. This guy was 47 and presumably not sloshed at the office while conducting top secret nuclear surveillance.