It can be genetic, and it can also happen to any random chicken. So, really, there's no breed specifics, but bad breeding can introduce it to a strain.
So sorry for you loss though, but hey, you did exactly what I'd do - And I find those photos so interesting, and gosh, that would have been painful. Wish I did this with my last Brahma - I labeled her death's cause as being eggbound, but I wasn't 100% sure.