  We consider indirect detection of meta-stable dark matter particles decaying
into a stable neutral particle and a pair of standard model fermions. Due to
the softer energy spectra from the three-body decay, such models could
potentially explain the AMS-02 positron excess without being constrained by the
Fermi-LAT gamma-ray data and the cosmic ray anti-proton measurements. We
scrutinize over different final state fermions, paying special attention to
handling of the cosmic ray background and including various contributions from
cosmic ray propagation with the help of the \textsc{LikeDM} package. It is
found that primary decays into an electron-positron pair and a stable neutral
particle could give rise to the AMS-02 positron excess and, at the same time,
stay unscathed against the gamma-ray and anti-proton constraints. Decays to a
muon pair or a mixed flavor electron-muon pair may also be viable depending on
the propagation models. Decays to all other standard model fermions are
severely disfavored.
