Mr. Cliborn was allegedly last seen alive around 6:00 p.m. at his Inverness Business Park Office on March 10, 1988. A short time later, two of the company's project managers returned from completing a job to find Bill Cliborn laying on his office floor, bloody and viciously bludgeoned to death. Evidence has pointed that this cold blooded murder was committed by someone he knew. Anyone with information regarding this case, is asked to please contact the Arapahoe County Sheriff Office at (303) 795-4711.