Police are attempting to find the head of a man who was allegedly murdered and decapitated by his model and former reality television star girlfriend.

Officers discovered the burnt and dismembered remains of Julian Story, 39, on the bathroom floor of an apartment in the coastal city of Port Lincoln in southern Australia last Tuesday when responding to reports of a small fire.

Tamika Sueann-Rose Chesser, a 34-year-old former contestant on Beauty and the Geek Australia, was arrested two days later and charged with murder.

Police found Ms Chesser sitting in the back garden of the property “in a catatonic and unresponsive state,” according to court documents.

Ms Chesser, a model and actress, is also charged with disposing of human remains to pervert the course of justice and assaulting a police officer.