Murder of Vivianne Ruiz
The murder of Vivianne Ruiz occurred in Sydney, Australia. Her body was discovered in garbage bags on 28 December 1991 without any identification. A postmortem found strangulation to be the likely cause of death. Animal hairs were found on the body, and newspaper was stuffed inside her mouth. On its removal, fingerprints in what appeared to be blood were present but could not be immediately identified. Investigators spent many weeks attempting to identify the victim. A sustained and significant media campaign was also conducted. Investigators were eventually contacted by a former associate of the victim who recognised her as Vivianne Ruiz. Investigators discovered Ruiz had been in a relationship with an individual named Richard White. White was a convicted criminal with a history of assault and drug trafficking. He had grown to know Ruiz through her work as a prostitute and dancer in the Kings Cross nightclubs in Sydney. Investigators discovered White had left Australia shortly after Ruiz was found murdered. The fingerprint found on the newspaper Ruiz's killer had left in her throat was initially considered not to belong to White. Later testing demonstrated that a tonal reverse had occurred, a rare event where the valleys between fingerprint ridges transfer blood from the grooves of the fingerprint, as opposed to its ridges. Investigators eventually tracked White to England, where he was living with relatives. A warrant was sought in England for his arrest, which was eventually made in Newcastle by local detectives and Scotland Yard. White returned to Australia to face trial for the murder. After two trials were aborted due to his abnormal conduct, he was eventually found guilty in 1996 and sentenced to the maximum jail term permitted in New South Wales at the time, which was fifteen years with a minimum of nine before being eligible for parole. Background 
The body of a female was located on the side of a suburban street in Sydney, Australia on 28 December 1991. It was wrapped in garbage bags, indicating to investigators that the victim was murdered elsewhere and transported to the location. She had suffered head injuries, and officers observed something inside her mouth that appeared at the time to be paper. A ligature was around her throat. There was no identification found on the body. Investigators described the murder as a "frenzied attack", and "a callous, very brutal murder". Post-mortem 
A post mortem examination found the victim weighed  and was   tall, and was estimated to be between 16 and 25 years old. The victim was found to have suffered injuries, with a wound on her head and strangulation marks on the throat. Bruises indicated she had been further injured after her death. Newspaper was removed from the mouth and revealed to be two full-sized sheets of the Sydney Morning Herald, dated 10 December 1991. Three distinct fingerprint patterns were identified. The fingerprints were photographed, and then enhanced with ninhydrin, an organic compound that can detect fingerprints. The practice is commonly used by forensic investigators in the analysis of latent fingerprints on porous surfaces such as paper, as the amino acids in sweat secretions that gather on a finger's unique ridges transfer to surfaces when touched. Exposure of the surface to ninhydrin converts the amino acids into visibly coloured products and thus reveals the print. Once completed, the fingerprint was fed into the police fingerprint database, though no match was found. A significant number of animal hairs were also found during the post-mortem. Tests showed that these were from a domestic dog, possibly a German Shepherd. Investigation 
By the time the post-mortem was over, the body had not been identified. The victim's clothing led investigators to believe she had been local to the area. Several weeks after the body was found, and despite a strong community response, investigators were frustrated at not being able to identify the victim. The murder was considered to be the "most puzzling murder mystery in Sydney for decades", with media reports observing that not since the 1930s had an inability to identify a victim caused such difficulty in a murder investigation. Inspections of missing person files did not identify the victim, though many other missing person files were closed as a result. Identification 
Investigators fielded a significant number of calls each day from people offering information. Police eventually received a phone call from a witness who claimed to recognise the victim as her friend, Vivianne Ruiz. The witness viewed the items of property belonging to the victim in police possession and subsequently confirmed they belonged to Ruiz. Investigators obtained a copy of a lease for a property in King's Cross in the name of Ruiz, and fingerprints on the lease matched those of the victim. Dental records later positively identified Ruiz. Ruiz was born in Spain, and settled in Australia in 1982. She initially resided on the Gold Coast in Queensland before moving to Sydney. After moving to Sydney, Ruiz took up residence in the King's Cross property and started working as a prostitute and dancer in local nightclubs. Richard White 
Investigators discovered Ruiz had been dating a man named Richard White, a bodybuilder and drug dealer who had previously beaten Ruiz. A travel agent confirmed that Ruiz and White had been planning an overseas trip. The day before Ruiz's body was found, White cancelled the tickets and had the refund sent to his home. White's fingerprints were compared to those found on the newspaper. The fingerprints were pictorially similar but not identical. Testing concluded the fingerprint was that of White. White, by pressing the paper firmly when placing it inside Ruiz's throat, had caused a tonal reverse, an event where the valleys between fingerprint ridges transfer blood from the grooves of the fingerprint as opposed to its ridges. Investigators sent a uniformed police officer to the home of White's parents, who discovered he was currently living overseas at the house of his aunt and uncle in Newcastle, England. The police officer reported that the parents owned a German Shepherd. The investigators found White had previously owned a van, and after tracking down the new owner, they searched the van and discovered bloodstains and animal hairs inside it. Arrest 
White was found to be living with his aunt and uncle at their home in Newcastle, the hometown of his parents. White was eventually arrested by detectives from the local police station and Scotland Yard on 29 April 1992. White did not resist the arrest, and his relatives were unaware of the police investigation. In his possession was a set of notes, one of which he had written to himself that stated "Convince yourself of your innocence...don't fuck up". Extradition 
New South Wales police applied to have White extradited to Australia. White eventually agreed to return to Sydney voluntarily to face murder charges, with a spokesperson stating White maintained his innocence but decided it was "in his best interests" to return. He arrived in Sydney on 13 September 1992. White was refused bail. Pre-trial proceedings 
A committal hearing was held for investigators to demonstrate to a court that there was sufficient evidence for White to stand trial for the murder of Ruiz. White's lawyer questioned investigators about the fingerprint found on the newspaper within Ruiz's throat. While conceding the fingerprint belonged to White, she argued investigators were unable to establish to the required evidentiary standard that the substance forming the fingerprint was blood. She went on to propose that the tests used to demonstrate a "positive" reaction to blood would have been the same for any protein-based substance. The lawyer concluded with an argument that White may have been eating a meat pie with tomato sauce on it while reading the newspaper and that such a food would react to the test used to demonstrate the fingerprint was blood. However, investigators rebutted this argument by demonstrating that the position of the fingerprint would have meant the newspaper was being read upside down at the time the fingerprint was made. White was sent to stand trial for the murder in the Supreme Court of New South Wales. Trial and conviction 

Two attempts to try White for the murder were aborted due to his abnormal conduct, such as threatening to kill the judge and prosecutor. In June 1996, White stood trial for a third time and remained quiet during proceedings. The prosecutor produced witnesses in blood, hair, and fingerprints. White's lawyers focused on the fingerprints, attempting to argue they may have appeared on the newspaper innocently at a time prior to the murder. The defence team successfully convinced the court that the blood found in White's discarded van would have been contaminated by the water used to test the sample and that the dog hairs found on Ruiz may have come from any German Shepherd. White told the court, "I did not kill Vivian. I had no reason to kill her. I am innocent. Thank you". The judge, Peter Hidden, acknowledged that the case made by the prosecution was circumstantial and that, in isolation, the evidence presented was not compelling. Investigators considered the fingerprint to be the key item of evidence and that everything else in the case was contingent on successfully proving the fingerprint belonged to White and was from the blood of Ruiz. The judge acknowledged that the fingerprint found on the newspaper was that of White and that this evidence was the "centrepiece" of the case against White. The judge stated:

 The judge found that White killed Ruiz in a fit of passion. However, what triggered the attack, where Ruiz was murdered, and White's motive remain unknown. Sentencing 
White was later sentenced to the maximum penalty applicable in New South Wales at the time: 15 years in prison of which he served at least 9 before being eligible for parole. References

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1990s murders in Australia
1991 crimes in Australia
1991 murders in Australia
December 1991 events in Australia
Female murder victims
Murder in Sydney
Violence against women in Australia