  The hints from the LHC for the existence of a $W'$ boson of mass around 1.9
TeV point towards a certain $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ gauge
theory with an extended Higgs sector. We show that the decays of the $W'$ boson
into heavy Higgs bosons have sizable branching fractions. Interpreting the
ATLAS excess events in the search for same-sign lepton pairs plus $b$ jets as
arising from $W'$ cascade decays, we estimate that the masses of the heavy
Higgs bosons are in the 400--700 GeV range.
