A 74-year-old woman who state police said caused a fatal crash on Route 581 this summer died last month as a result of cancer. Investigators had sufficient evidence to arrest Joyce G. Case of Upper Allen Twp., probably on a homicide by vehicle charge, in the late July crash that killed Carlisle truck driver Kenny Wallace, 43, Cumberland County District Attorney Skip Ebert said yesterday. The probe ended with Case's death, however, because the dead cannot be prosecuted. "We consider the matter closed," Ebert said. "It's a bad situation all around." Ebert said investigators didn't know Case had terminal cancer...