  Secondary photons from decays of metastable neutralinos can contribute to the
ultra-high energy cosmic ray flux. The neutralino production rate is too low in
acceleration mechanisms to affect the cosmic ray spectrum without emitting
enormous energy in photons and neutrinos. However, in top-down models with
sources not concentrated in galactic halos, neutralino decays change the
spectrum significantly. We estimate the parameters of a model in which photons
from neutralino decays are responsible for cosmic ray events with energies
above 10^20 eV, and figure out distinctive experimental signatures for this
model.
