Rick Page died while "reading sales forecasts in the bath". He never specifies where he worked, but indicates that the forecasts were "really dull".
When Mark Chase, president and CEO of Dandy Lion Worldwide Enterprises, started using cadavers instead of crash test dummies to conduct safety tests on the Dandy Lion SX, in order to avoid capturing electronic evidence of defects with the car, Rick's body was one of the cadavers selected, along with a few dozen others. 
Exactly how Rick died is never stated. Although Chase had already committed murder in the past to protect his company, it seems highly unlikely that Rick and the other people used as human crash test dummies were killed by the company; the fact that they volunteered their bodies for such research indicates they may have simply been provided to the company following their deaths.