He has already been charged with murder. Today he pleaded not guilty to the charges. Maybe you mean convicted?
A plea deal for a lesser charge (like manslaughter) hasn't been spoken of in MSM, but I guess it is a possibility still - although I think that typically happens prior to a trial.
I think that the shaky thing here is if his lawyer has been able to get his police interview thrown out of evidence. IIRC he was going to try to do that. He had a problem with the police interview. Although I have read that the police allowed GL to shower and eat before interviewing him, and that he was a willing participant.
imo
Mr Lynn, who was dressed in a dark-coloured suit, stood in front of dozens of potential jurors and formally pleaded "not guilty" to murdering Russell Hill and Carol Clay.
A Supreme Court judge has told a panel of potential jurors that it will be alleged Greg Lynn shot Carol Clay and killed Russell Hill, who both went missing while camping in Victoria's High Country in 2020.
www.abc.net.au