The company that created the first OS for micro-computers. Digital Research was eventually purchased by Novell, who in turn sold the it to Caldera. DRI was founded by Gary Kildall, who died in the mid 90's from complications stemming from a bar fight.

Its debut product was of course CP/M, which was destroyed by Microsoft (at that time, Microsoft was Bill Gates). It eventually gained some market share with DR-DOS, which was also killed by Microsoft (by continually tinkering with Windows and MS-DOS to keep it from running under DR-DOS. This resulted in a recently-settled lawsuit).

Gary Kildall in fact died of complications from falling off a ladder or a roof, as I recall.