  The diffuse galactic EGRET gamma ray data show a clear excess for energies
above 1 GeV in comparison with the expectations from conventional galactic
models. The excess is seen with the same spectrum in all sky directions, as
expected for Dark Matter (DM) annihilation. This hypothesis is investigated in
detail. The energy spectrum of the excess is used to limit the WIMP mass to the
50-100 GeV range, while the sky maps are used to determine the halo structure,
which is consistent with a triaxial isothermal halo with additional enhancement
of Dark Matter in the disc. The latter is strongly correlated with the ring of
stars around our galaxy at a distance of 14 kpc, thought to originate from the
tidal disruption of a dwarf galaxy. It is shown that this ring of DM with a
mass of $\approx 2\cdot 10^{11} M_\odot$ causes the mysterious change of slope
in the rotation curve at $R=1.1R_0$ and the large local surface density of the
disc. The total mass of the halo is determined to be $3\cdot 10^{12} M_\odot$.
A cuspy profile is definitely excluded to describe the gamma ray data. These
signals of Dark Matter Annihilation are compatible with Supersymmetry for boost
factors of 20 upwards and have a statistical significance of more than
$10\sigma$ in comparison with the conventional galactic model. The latter
combined with all features mentioned above provides an intriguing hint that the
EGRET excess is indeed a signal from Dark Matter Annihilation.
