  We introduce kernel estimators for the semicircle law. In this first part of
our general theory on the estimators, we prove the consistency and conduct
simulation study to show the performance of the estimators. We also point out
that Wigner's semicircle law for our new estimators and the classical empirical
spectral distributions is still true when the elements of Wigner matrices don't
have finite variances but are in the domain of attraction of normal law.
