  In extended Higgs sectors, heavy Higgs bosons can decay via cascades to a
light Higgs boson plus $W$ and $Z$ bosons. We study signals of such sectors at
the Tevatron and LHC that result from resonant production of a heavy $H^0$
followed by the decay $H^0 \to H^\pm W^\mp$ with $H^+ \to W^+ h^0 \to W^+
b\bar{b}$ or $H^+ \to t\bar{b} \to W^+ b\bar{b}$. The final states have the
same particle content as that of $t\bar{t}$ production, but with a resonant
structure that can be used to distinguish signal events from background events.
We propose analysis techniques and estimate the experimental sensitivity of the
Tevatron and LHC experiments to these signals.
