Satish Narayan, 47, an engineer, lost his battle to survive at the Royal Adelaide Hospital yesterday, 20 days after sustaining burns to most of his body.
The incident has now been declared a major crime by police and it is likely his wife, Rajini, will face a charge of manslaughter or murder.
Police have alleged Narayan's wife doused his genitals with ethanol and then set him on fire about 5:30 a.m. on Dec. 7.
It is believed a major blaze was sparked at the couple's townhouse when Narayan jumped out of bed and knocked over the bottle of methylated spirit.
Narayan suffered burns to 85 per cent of his body.