  We propose a new freeze-in dark matter candidate which feebly couples to the
standard model charged leptons. The feeble interactions allow it (i) to
freeze-in from the Standard Model thermal bath with its relic density being
either a fraction or the entirety of the observed dark matter density and (ii)
to radiatively decay to two photons in the dark matter mass ranges of order keV
scale with lifetime larger than the age of Universe. These features make this
model a realistic realization of dark matter with late-time decay to reduce
Hubble tension. We show the best-fit value of H_{0}=68.31(69.34) km
s^{-1}Mpc^{-1} in light of Planck 2018+BAO(+LSS)+Pantheon data sets. We then
use stellar cooling data to place constraints on the parameter space favored by
the Hubble tension. While the universal coupling scenario is excluded, the
hierarchical coupling scenario can be tested by future observations of white
dwarfs after a careful look into photon inverse decay, Primakoff and
Bremsstrahlung emission of the dark matter in various stellar systems. The
viable parameter space may be linked to anomalies in future X-ray telescopes.
