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A number of theories, spanning a wide range of mass scales, predict darkmatter candidates that have lifetimes much longer than the age of the universe,yet may produce a significant flux of gamma rays in their decays today. Weconstrain such late decaying dark matter scenarios model-independently byutilizing gamma-ray line emission limits from the Galactic Center regionobtained with the SPI spectrometer on INTEGRAL, and the determination of theisotropic diffuse photon background by SPI, COMPTEL and EGRET observations. Weshow that no more than ~5% of the unexplained MeV background can be produced bylate dark matter decays either in the Galactic halo or cosmological sources.

Circumscribing Late Dark Matter Decays Model Independently