  The E815 (NuTeV) neutrino experiment has performed a search for a 33.9
MeV/c^2 weakly-interacting neutral particle produced in pion decay. Such a
particle may be responsible for an anomaly in the timing distribution of
neutrino interactions in the KARMEN experiment. E815 has searched for this
particle's decays in an instrumented decay region; no evidence for this
particle was found. The search is sensitive to pion branching ratios as low as
10^-13.
