Two ex-lovers are expected to learn their fate over the manslaughter of the man's half-brother, who was hog-tied, bashed and stabbed.

Trent Errington, 31, and his then-girlfriend Rhiannon Lisa Bloodsworth, 24, were in October found guilty of the manslaughter of Jay Cerin, who was left to die in his Sydney home two-and-a-half years ago.

Last week the victim's mother Fiona Cerin told the NSW Supreme Court she's still haunted by images of her son's final hours when he was "begging for his life".

"I couldn't even kiss my son goodbye because you both ran and left him to rot," Ms Cerin said in a victim impact statement.

"How scared the poor boy must have been and the pain he must have suffered during that time by someone he trusted."

The pair is due to be sentenced in the same court on Thursday.

© AAP 2018