  The slow evolution of the M/L ratios, colors, and line strengths of cluster
early-type galaxies to z=1 suggests that their stars were formed at very high
redshift. At the same time, morphological studies of distant clusters indicate
significant evolution in the early-type galaxy population. Striking evidence
for strong morphological evolution in clusters is the discovery of a large
number of red merger systems in the cluster MS 1054-03 at z=0.83. The presence
of these mergers is qualitatively consistent with predictions from hierarchical
galaxy formation models, and is direct evidence against an early collapse for
all early-type galaxies. In most of the mergers there is no evidence for strong
star formation. Therefore the mean stellar ages of the merger products will be
much older than the ``assembly age'', and do not violate the constraints on the
star formation epoch of early-type galaxies imposed by the color-magnitude
relation and the Fundamental Plane.
