Mental Profile - Sadism

Paul Charles Denyer became one of Australia's most infamous serial killers after murdering three young women in Melbourne's bayside suburb of Frankston between June and July 1993. His crimes created widespread fear throughout Victoria, leading to one of the state's largest homicide investigations. Following his arrest, Denyer pleaded guilty to the murders and was sentenced to life imprisonment with a non-parole period. He remains incarcerated and is one of Australia's most notorious convicted serial killers.

Kalen Schlatter is a Canadian convicted murderer who killed 22-year-old Tess Richey after meeting her in Toronto's Church-Wellesley Village in November 2017. Schlatter accompanied Richey to a secluded outdoor stairwell, where prosecutors established that he sexually assaulted and strangled her before leaving her body concealed at the location. Richey's mother discovered her body several days later after conducting her own search. Schlatter was arrested in February 2018 and convicted of first-degree murder in March 2020. He was sentenced to life imprisonment with no possibility of parole for 25 years.

Jack the Ripper is an unidentified serial killer responsible for a series of murders in the Whitechapel district of London in 1888. His crimes shocked Victorian society and became one of the most infamous unsolved cases in criminal history. Operating over a short but intense period, the killer targeted vulnerable women and carried out highly violent attacks before disappearing without identification. His ability to evade capture, combined with the brutality of the crimes and widespread media attention, has cemented his place as one of history’s most enduring criminal figures.

Ivan Milat was an Australian serial killer responsible for the murders of multiple backpackers in New South Wales between 1989 and 1992. His crimes became one of the most notorious cases in Australian criminal history. Milat targeted travellers and used deception to gain their trust before carrying out violent attacks. He was later convicted and sentenced to life imprisonment without parole, remaining incarcerated until his death in 2019.

Richard Ramirez, known as the “Night Stalker,” was an American serial killer who carried out a series of murders and attacks across California between 1984 and 1985. His crimes were marked by unpredictability, extreme violence, and a lack of a consistent victim profile. Ramirez created widespread fear due to the random nature of his attacks and his ability to evade capture for an extended period. He was later convicted of multiple murders and sentenced to death, becoming one of the most infamous serial killers in U.S. history.

John Wayne Gacy was an American serial killer and sex offender who murdered multiple victims in Illinois during the 1970s. He became widely known for maintaining a public image as a community figure while committing crimes in secret. Gacy’s case gained notoriety due to the scale of his offences and the contrast between his outward persona and his actions. He was later convicted and sentenced to death, becoming one of the most infamous serial killers in U.S. history.