  I investigate production and decay of heavy neutral gauge bosons Z' in
GUT-inspired U(1)' groups and in the Sequential Standard Model. In particular,
decays into supersymmetric particles, such as slepton, chargino and neutralino
pairs, as predicted in the MSSM, are accounted for, with a special interest in
final states with leptons and missing energy. For a representative point of the
parameter space, it is found that the inclusion of supersymmetric decay modes
has an impact of 200-300 GeV on the Z' mass exclusion limits.
