Edna Cowell Martin reflects on her bond with cousin Ted Bundy, initially charmed by his charisma. Unaware of his dark deeds, her perception shattered upon his arrest. In her new book, she shares her shock and grief, offering a personal view of Bundy's impact on their family.

Despite evolving forensic technology, traditional investigative methods are still proving valuable to revisiting unsolved cases.

Frank Figliuzzi, former FBI assistant director for counterintelligence, on his book 'Long Haul: Hunting the Highway Serial Killers' on how murders by truckers have changed over the years.

Reginald Reed Jr. on the aftermath of the murder of his mother, Selonia Reed, and 35 years later, his father Reginald Reed Sr.'s conviction in the case.

Kaitlin Armstrong killed pro cyclist Anna Moriah Wilson, who was having a secret relationship with Armstrong's boyfriend, pro cyclist Colin Strickland and is currently serving 90 years in prison.

Dr. Kirk Yeager, the FBI's chief explosives scientist, works to understand bombs, bombers and the conditions that allow them to thrive to prevent future disasters.

In the 2000s, the New Mexico desert became a graveyard for 11 females and an unborn child--their lives taken by a serial killer who became known as The West Mesa Bone Collector. His victims' stories echo for justice.

In cases of abuse victims killing their abusers, the law grapples with justice. From Francine Hughes' fiery retribution to Gypsy Rose Blanchard's plea for mercy, each case tests the limits of understanding trauma and self-defense.

We speak to Katherine Ramsland, an author and professor of forensic psychology, who unravels Elmer Wayne Henley Jr.'s unsettling involvement with Houston serial killer Dean Corll in her book 'The Serial Killer's Apprentice.'

Single mom disappears after dating; strange texts follow. Years later, investigators unravel web of deceit, leading to murderer's conviction.