  We introduce a simple scenario involving fermionic dark matter ($\chi$) and
singlet scalar mediators that may account for the Galactic Center GeV
$\gamma$-ray excess while satisfying present direct detection constraints.
CP-violation in the scalar potential leads to mixing between the Standard Model
Higgs boson and the scalar singlet, resulting in three scalars $h_{1,2,3}$ of
indefinite CP-transformation properties. This mixing enables s-wave
$\chi{\bar\chi}$ annihilation into di-scalar states, followed by decays into
four fermion final states. The observed $\gamma$-ray spectrum can be fitted
while respecting present direct detection bounds and Higgs boson properties for
$m_{\chi} = 60 \sim 80 $ GeV, and $m_{h_3} \sim m_{\chi}$. Searches for the
Higgs exotic decay channel $h_1 \to h_3 h_3$ at the 14 TeV LHC should be able
to further probe the parameter region favored by the $\gamma$-ray excess.
