Shawn Grate
Shawn Grate is a serial killer, also known as The Ohio Strangler, who was convicted for multiple murders in the United States.
Sheila York
Sheila York is accused of kidnapping a missing woman's baby and passing it off as her own
Sidney Cooke
Sidney Cooke is a convicted murderer in the UK, responsible for a series of violent crimes in the late 1990s
Skylar Deleon
Skylar Deleon is an American criminal convicted of the murders of a couple in a scheme involving the theft of a yacht. The victims were bound and thrown overboard in a calculated and premeditated crime. Deleon was sentenced to death, and the case gained widespread attention due to the brutality of the murders and the unusual circumstances surrounding the crime.
Stacey Castor
Stacey Castor was an American woman convicted of murdering her husband and attempting to frame her daughter for the crime. She used poison as the method, leading to her nickname "The Black Widow." Castor was arrested and convicted, receiving a prison sentence. She died in custody in 2016. Her case is notable for the manipulation and deception involved in the crimes.

Stanley Williams
Stanley “Tookie” Williams was an American gang leader and co-founder of the Crips, one of the most well-known street gangs in the United States. He was later convicted of multiple murders committed during robberies in California in 1979. Williams became a controversial figure due to claims of personal reform while on death row. Despite widespread appeals for clemency, he was executed in 2005, and his case remains widely discussed due to the contrast between his early criminal activity and later efforts against gang violence.
Stefano Brizzi
Stefano Brizzi is featured in World's Most Evil Killers as a convicted murderer who committed multiple killings.

Stephanie Hudnall
Stephanie Hudnall became the focus of a high-profile Oklahoma homicide investigation following the death of her husband, William "Bill" Hudnall, in June 2011. Although she initially claimed he had died from natural causes, investigators uncovered evidence that Bill had been intentionally poisoned. Following a lengthy investigation and trial, Stephanie Hudnall was convicted of first-degree murder and sentenced to life imprisonment.