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We consider a class of late-decaying dark-matter models, in which a darkmatter particle decays to a heavy stable daughter of approximately the samemass, together with one or more relativistic particles which carry away only asmall fraction of the parent rest mass. Such decays can affect galactic halostructure and evolution, and have been invoked as a remedy to some of the smallscale structure-formation problems of cold dark matter. There are existingstringent limits on the dark matter lifetime if the decays produce photons. Byconsidering examples in which the relativistic decay products instead consistof neutrinos or electron-position pairs, we derive stringent limits on thesescenarios for a wide range of dark matter masses. We thus eliminate a sizableportion of the parameter space for these late decay models if the dominantdecay channel involves Standard Model final states.

Lifetime Constraints for Late Dark Matter Decay