Karoushi (also "karooshi" or "karoshi") is a somewhat-recently invented Japanese word for "death from overwork." It doesn't necessarily imply the means of death, but it's generally considered to be when a salaryman dies of a heart attack on the job. Depending on the cause of death (and often the deceased's work ethic, i.e., 12+ hour workdays), the victim's family is financially compensated by the corporation.
"Karoushi" is also a personal favorite word to scream repeatedly at work when my boss is wondering what's on my monitor.