  We augment the hidden Stueckelberg $Z'$ model by a pair of Dirac fermions in
the hidden sector, in which the $Z'$ has a coupling strength comparable to weak
scale coupling. We show that this hidden fermion-antifermion pair could be a
milli-charged dark matter candidate with a viable relic density. Existing
terrestrial and astrophysical searches on milli-charged particles do not place
severe constraints on this hidden fermion. We calculate the flux of
monochromatic photons coming from the Galactic center due to pair annihilation
of these milli-charged particles and show that it is within reach of the next
generation $\gamma$-ray experiments. The characteristic signature of this
theoretical endeavor is that the Stueckelberg $Z'$ boson has a large invisible
width decaying into the hidden fermion-antifermion pair. We show that existing
Drell-Yan data do not constrain this model yet. Various channels of singly
production of this $Z'$ boson at the LHC and ILC are explored.
