Lynn, 58, is due to be sentenced in the Victorian Supreme Court on Friday after a jury in June found him guilty of killing Mrs Clay.
He shot her in the head at a Victorian Alps campsite in March 2020, placed her body - and the body of her lover Russell Hill - into a trailer and then drove them to a remote bush track.
Greg Lynn was convicted of murdering Carol Clay but acquitted over her lover Russell Hill's death. (HANDOUT/VICTORIA POLICE, 9NEWS)
Lynn returned seven months later after the COVID-19 lockdown lifted to burn their remains into more than 2000 bone fragments.
The former Jetstar pilot maintained his innocence, claiming both deaths were accidental.
After a month-long trial, the jury found him guilty of murdering Mrs Clay but acquitted him over Mr Hill's death.
Lynn continues to deny the murder but conceded he destroyed the couple's remains and much of the campsite's evidence.
At a pre-sentence hearing in September, prosecutor Daniel Porceddu called for Lynn to be jailed for life for the "cold-blooded and callous" murder of a vulnerable elderly woman.
Lynn's barrister Dermot Dann KC said the jury went down a "forbidden pathway" in delivering split verdicts, arguing there was no clear motive for the killings.
Mr Dann also flagged an appeal to Lynn's murder conviction, claiming the prosecution conducted the trial unfairly and there were inconsistencies in the two verdicts.
Justice Michael Croucher is scheduled to hand down his sentence on Friday morning.
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