Gone South - Robert R. McCammon

A veteran's moment of rage leads to a chase through the bayou in this tale of "jackhammer suspense" by the New York Times–bestselling author of Swan Song (Kirkus Reviews).
Two decades after he finished serving his country in the jungles of Southeast Asia, Dan Lambert still pays the price. As he hustles for construction work in the heat of a brutal Louisiana summer, Dan tries to ignore the pounding in his head—a constant reminder of the Agent Orange–caused leukemia which will soon end his life. And now the bank wants to repossess his truck. His attempt to reason with the loan officer does not get him far. Dan loses himself in rage, and for a moment is back in the jungle again. When he comes out of his bloodlust, he has shot the banker through the chest. There is nothing to do but run. On his trail are two peculiar bounty hunters: a onetime Siamese twin and a heavyset Elvis impersonator. To save his own life, Dan is going to have to remember why it was worth living in the first place.