Marcus Peter Volke cut his own throat while fleeing police, who had been called to his high-end apartment building to investigate a decaying smell, News.com.au reported.
Officers discovered a body part, believed to belong to his Indonesian girlfriend, in a pot on the stove as well as other parts of her mutilated body in the ground-floor apartment.
Dorothy Volke, his mother, said that when she spoke to her son recently, he seemed happy and fine.
Police told her that they still had to formally identify the body with dental records and an autopsy, she further added.
Volke fled from his apartment on foot but his body was later found in a nearby street with a fatal self-inflicted throat wound.