  The STAR collaboration at RHIC reports measurements of the inclusive yield of
non-photonic electrons, which arise dominantly from semi-leptonic decays of
heavy flavor mesons, over a broad range of transverse momenta ($1.2 < \pt < 10$
\gevc) in \pp, \dAu, and \AuAu collisions at \sqrtsNN = 200 GeV. The
non-photonic electron yield exhibits unexpectedly large suppression in central
\AuAu collisions at high \pt, suggesting substantial heavy quark energy loss at
RHIC. The centrality and \pt dependences of the suppression provide constraints
on theoretical models of suppression.
