The background check lead Mulder to Senator Richard Matheson ( Raymond J. Barry ) , which result in a dead end . Scully discover Skinner 's blood sample and , after checking , she find that Skinner 's blood contain multiplying carbon . Meanwhile , Skinner end up in hospital following a gunfight in the FBI parking garage . Mulder and Scully reunite at the hospital , where Mulder tell Scully that Skinner was investigating a health funding bill called S.R. 819 . Later , the physicist die of the same carbon blood condition from which Skinner is sick .