Patricia’s family want to bury her themselves.
“Give us the rest of her remains so we can bury her with dignity,” her brother Mark Knowles said after Riggs was acquitted of murder last month.
A Brisbane Supreme Court jury instead found the 60-year-old guilty of manslaughter.
The court heard he fatally pushed his wife and the buried her on the outskirts of Caboolture in the dead of night, telling friends and family she had simply run off.
He later reburied her at the family home, where a new property owner found remains in 2016.
Riggs will be sentenced on March 18.