  The ATLAS collaboration has recently reported a 2.6 sigma excess in the
search for a heavy resonance decaying into a pair of weak gauge bosons. Only
fully hadronic final states are being looked for in the analysis. If the
observed excess really originates from the gauge bosons' decays, other decay
modes of the gauge bosons would inevitably leave a trace on other exotic
searches. In this paper, we propose the use of the Z boson decay into a pair of
neutrinos to test the excess. This decay leads to a very large missing energy
and can be probed with conventional dark matter searches at the LHC. We discuss
the current constraints from the dark matter searches and the prospects. We
find that optimizing these searches may give a very robust probe of the
resonance, even with the currently available data of the 8 TeV LHC.
