The role was originally played by Caroline Gillmer.
Byrne was last seen in Nine’s short-lived drama Tricky Business.
Also not expected to return are Kat Stewart (Roberta Williams), Damian Walshe-Howling (Andrew ‘Benji’ Veniaman), Callan Mulvey (Mark Moran) and narrator Caroline Craig.
However Nine has already announced returning cast are Robert Mammone as Mokbel, Vince Colosimo as Alphonse Gangitano,
Gyton Grantley as Carl Williams, Les Hill as Jason Moran, Madeleine West as Danielle McGuire, Simon Westaway as Mick Gatto, Gerard Kennedy as Graham Kinniburgh and Kevin Harrington as Lewis Moran. They are joined by Shane Jacobson, Stephen Curry, Debra Byrne, Steve Bastoni, Richard Cawthorne, Simone Kessell, Nicholas Bishop and Hollie Andrew.
Nine is thrilled with filming currently taking place in Brunswick with set dressing said to have improved some of the locations being used for the nine part drama.
It will air in 2014.