  The HyperCP collaboration has observed three events for the decay Sigma^+ ->
p mu^+ mu^- which may be interpreted as a new particle of mass 214.3 MeV.
However, existing data from kaon and B-meson decays severely constrain this
interpretation, and it is nontrivial to construct a model consistent with all
the data. In this letter we show that the ``HyperCP particle'' can be
identified with the light pseudoscalar Higgs boson in the next-to-minimal
supersymmetric standard model, the A_1^0. In this model there are regions of
parameter space where the A_1^0 can satisfy all the existing constraints from
kaon and B-meson decays and mediate Sigma^+ -> p mu^+ mu^- at a level
consistent with the HyperCP observation.
