Mayang Prasetyo, a 27-year-old Indonesian trans woman, had settled in Brisbane with partner Marcus Volke, who is reported to have moved from Austria to Australia, and grown up in Ballarat.
It is believed the couple met while they were both working on international cruise ships.
The young chef reportedly killed her, dismembered her body and boiled some of the severed parts in a chemical stew at the apartment they shared in the exclusive Brisbane suburb of Teneriffe.
Mr Volke was reportedly caught by police when they responded to reports of a foul smell coming from the apartment on Saturday.
He fled the ground floor apartment when police arrived and evaded them by hiding in a large bin in a lane beside the apartment complex. Police said he then killed himself with a knife.
Mr Volke's mother Dorothy Volke, who lives in Victoria, confirmed it was her son who had died in the tragedy and said he gave no hint there was anything wrong when she last spoke with him.
One of two Facebook pages Mr Volke had indicated that he was an opponent of violence against women, as well as against animal cruelty.
He listed his most recent residential city as Vienna, and also regularly posted petitions calling to end the Israeli occupation of Palestine and the violence in Gaza.