  Images have been obtained with the Hubble Space Telescope WFPC2 camera of
Andromeda I, a dwarf spheroidal (dSph) galaxy that lies in the outer halo of
M31. The resulting color-magnitude diagrams reveal for the first time the
morphology of the horizontal branch in this system. We find that, in a similar
fashion to many of the galactic dSph companions, the horizontal branch (HB) of
And~I is predominantly red. Combined with the metal abundance of this dSph,
this red HB morphology indicates that And I can be classified as a ``second
parameter'' system in the outer halo of M31. This result then supports the
hypothesis that the outer halo of M31 formed in the same extended chaotic
manner as is postulated for the outer halo of the Galaxy.
