  Earlier studies of the influence of Dark Matter keV sterile neutrinos on
neutrino-less double beta decay concluded that there is no significant
modification of the decay rate. These studies have focused only on a mass of
the keV sterile neutrino above 2 and 4 keV, respectively, as motivated by
certain production mechanisms. On the other hand, alternative production
mechanisms have been proposed, which relax the lower limit for the mass, and
new experimental data are available, too. For this reason, an updated study is
timely and worthwhile. We focus on the most recent data, i.e., the newest
Chandra and XMM-Newton observational bounds on the X-ray line originating from
radiative keV sterile neutrino decay, as well as the new measurement of the
previously unknown leptonic mixing angle $\theta_{13}$. While the previous
works might have been a little short-sighted, the new observational bounds do
indeed render any influences of keV sterile neutrinos on neutrino-less double
beta decay small. This conclusion even holds in case not all the Dark Matter is
made up of keV sterile neutrinos.
