  The Kerr-Schild form provides a natural way of realizing the classical double
copy that relates exact solutions in general relativity to exact solutions in
gauge theory. In this paper, we examine the asymptotic structure of Kerr-Schild
form. In Newman-Unti gauge, we find a generic solution space satisfying the
Kerr-Schild form in series expansion around null infinity. The news function in
the solution space is chiral and can not lead to a mass loss formula. A class
of asymptotically flat complex pp-wave solutions in closed form is obtained
from the solution space.
