Teenage drug abuser Joshua Nelson murders a friend in cold blood to steal his car, but other shocking motivations for the crime emerge at his trial.

Raised in an environment of drug addiction and crime, teenager Justin Dickens commits murder but disputes the prosecutor's version of events.

Sentenced for a triple murder linked by police to Satanism, Miguel Angel Martinez becomes the youngest person ever on death row in Texas.

Robert Shafer and a friend target a same-sex couple in a robbery, but their crime spins out of control into kidnapping and double murder.

Kenneth Foster's death sentence is commuted just hours before his execution, but he asserts that his punishment under an unusual Texas law is unfair.

After 24 years on death row, Joseph Murphy saw his sentence commuted a week before his execution due to the extreme abuse he suffered as a child.

Convicted murderer Wayne Doty admits his guilt but requests that his execution be carried out by electric chair, a method no longer used in Florida.

No one -- including David Lewis himself -- disputes that he committed murder. But Lewis's mental fitness remains in doubt despite his death sentence.

In 1996, David Barnett murdered his adoptive grandparents, stabbing them over 20 times. Later, he revealed years of abuse at the hands of his father.

After shooting his ex-girlfriend and her new lover, Charles Thompson is charged with manslaughter -- until his ex dies due to a hospital error.

After years in solitary confinement, James Robertson admits to murdering his new cellmate as an escape to the better conditions on death row.

After an unsuccessful attempt to kill his father, drug user Charles "Billy" Armentrout later murdered his grandmother and was sent to prison for life.

Toby Williams murdered Deborah Moore and shot her husband, John, in a cruel 1984 robbery for which he has been on death row for nearly 35 years.

Ezdeth Highley reflects on her murder conviction, her transition while being incarcerated and what she's learned during her ongoing 60-year sentence.

After fatally shooting a coworker, Thomas "TJ" Schiffens maintains his innocence. But details surrounding the crime suggest TJ had a motive.

Years after leaving the military, Toby Gregory claims his service and PTSD caused him to murder his wife, Inez. But Inez's family believes otherwise.

A murderer recounts the crime that ended one life and ruined his own. Those affected, including a police officer and the victim's family, also speak.

As Daniel maintains his innocence, more details about Jose Menchaca's murder come to light, shifting the focus to Candie's troubled past and cartel ties.

On death row for murder, Deryl Madison reflects on his struggles with mental illness and finds support from an anti-capital punishment advocate.

Leroy Schmitz claims he didn't mean to kill his wife during a drunken argument, pleading that an abusive childhood predisposed him to violence.

Enraged over his rebellious daughter's choice in men, an extremist father enlists his son in a terrifying plot of intimidation and murder.

By helping his fellow inmates, Jamel Hatcher feels he's turned his life around — but not everyone believes his rehabilitation is genuine.

James Walker claims he has no recollection of the 2001 murder he confessed to committing. An investigation into his traumatic past offers more context.

Convicted for killing his grandmother, Rex Groves insists he no longer holds murderous thoughts towards his family. But their trust isn't easily won.

Young love takes a dark turn when Ashley Morrison's plan to run away with her boyfriend, Christian Sims, results in the murder of his grandmother.

Subjected to abuse throughout her life, Victoria Smith confessed to killing her husband. But someone close to the case has doubts about her admission.