A fatal accident occurred Sunday morning in Morgan County.  According to the Highway Patrol, Carol Mace, 66, was driving on Route C at about 8:30 a.m. when she traveled off the side of the road, through a fence, and overturned the vehicle.  She was taken to University Hospital by helicopter with serious injuries.  Her passenger, Lisa DeCock, 55, of Moline, Iowa, was pronounced dead at the scene.