Linda Edwards' body was found inside her razed one bedroom unit on Rainford Street in November 2016.
Her son Kiri Paul Patira Brackenridge was later charged with murder, arson and dishonestly using her bank card.
He was 25 years old when he strangled her to death before stealing her bank card to buy petrol which he used to set her sofa alight.
Brackenridge appeared for sentencing this morning, where the court heard his journal writings showed he believed the sun god told him his mother was evil.