"Since the appeal for assistance in March, a number of new witnesses have come forward and their information has significantly progressed the investigation," police said. A number of the suspect's associates did help to hide her death by peddling a story that she was still alive and benefited from money that was taken from her bank account, police said. Sarah Gatt, pictured here in a recent photo, had a long battle with addiction, but dreamed of becoming a counsellor. Credit:Facebook. Ms Gatt's boyfriend was seen going through her mail at the Lambeth Street unit after she was killed in April. He told neighbours Ms Gatt was in a psychiatric ward. It's understood both he and associates told detectives they didn't know Ms Gatt's body was inside and if their DNA was found there, it was because they had gone to the flat to retrieve their belongings.

Police said Ms Gatt suffered trauma to her head and face and dismissed reports she had been decapitated. Forensic police went back to the unit on March 21 to re-examine the scene, but were yet to receive the results of the further tests. Police at Sarah Gatt's Kensington unit after the discovery of her body in January. Credit:Darrian Traynor Ms Gatt was a mother of four who had lived in the unit for about eight years. Her children did not live with her. She had stopped speaking with her father, Victor Gatt, and stepmother, Cheryl Gatt, about 18 months earlier. Mr Gatt said they too had tried time and time again to help Ms Gatt get clean after she started using drugs in her late teens.

“I lost my daughter,” Mr Gatt said. “I should have pushed myself to go and see her, but Sarah is the type of person if she doesn’t want to see you, she doesn’t want to see you." Sarah Gatt's family appeals for information at a police press conference. Cheryl Gatt said Ms Gatt dreamed of becoming a counsellor to help others, but was never able to fulfil her ambition. "No one deserved to die like that. No one. It doesn't matter what happened, or what her life was, she doesn't deserve to die like that."