Family members of killers, members of the victims' families, and detectives on each case open up about the emotions and shock experienced upon discovering the identities of murderers.
Drew Peterson
S1 E1
Stephen Peterson thinks he knows his father, Drew, better than anyone; small-town police officer Drew Peterson becomes a media sensation after his wife goes missing and drags his family down with him while trying to defend his reputation.
The Playboy Killer Paul Snider
S1 E2
Teenaged Patti Laurman believes silver-tongued Paul Snider when he promises to make her a Playboy model, just like his wife, Dorothy Statten; for Dorothy, the dream comes to a bloody end, and, now, an unsuspecting Patti is in the hands of a killer.
The Manson Family
S1 E3
Teenage Dianne was drawn into the Manson Family at 14, and was present when Charles Manson's peace-and-love philosophy became dark, dangerous and evil.
Sammy "The Bull" Gravano
S1 E4
When Sammy "The Bull" Gravano agrees to testify for the government against New York's organized-crime bosses, he could never have predicted the effect it would have on the life of his own daughter, Karen.
Donnie Brasco & Lefty Guns
S1 E5
"Lefty Guns" Ruggiero's granddaughter Ramona Rizzo makes it her mission to set the record straight when her grandfather's life is portrayed in the film "Donnie Brasco."
The Craigslist Killer Richard Beasley
S1 E6
After Richard Beasley uses a Craigslist ad to lure three men to their deaths, his daughter, Tonya, comes to realize that she has unwittingly assisted her father.
Harry "The Hook" Aleman
S1 E7
Chicago mobster Harry "The Hook" Aleman's daughter, Franky, stands by her father in spite of allegations that he was one of the most feared enforcers for the Chicago Outfit during the 1970s.
The Iceman Richard Kuklinski
S1 E8
Hit man Richard Kuklinski's daughters Merrick and Christin endure a childhood of terror in their father's house.
The Grim Reaper's Protégé
S1 E9
Larry Mazza's ex-wife, Christine, is not aware of her husband's true past when they get married; as gangster Greg Scarpa's protégé, Larry finds it hard to walk away from the mob even though it threatens to ruin his and Christine's lives.
The Classified Ad Rapist
S1 E11
Cynthia Bartlett is married for six years to her high school boyfriend, serial killer Bobby Joe Long, who eventually rapes women he met through classified ads and murders 10 women in Florida's Tampa Bay area.
The Orlando Nightclub Shooting
S1 E12
Omar Mateen's ex-wife Sitora struggles to break free of her unstable husband's abuse, but when he carries out one of the most devastating mass shootings in U.S. history, she's drawn into his world once again.
William Choyce
S1 E13
William Choyce's ex-wife, Alice, and daughter, Crystal, are grateful to be alive and together after they survived living with a serial killer as he descended into madness.
The Tourniquet Killer
S1 E14
When Anthony Shore preys on the youth of his neighborhood and his own children, his daughter Tiffany summons the courage to reveal the truth and stop a serial killer in his tracks.
Richard Paul White
S1 E17
Richard Paul White's sister Maureen loves and fears her brother, but after a childhood of devastating abuse, she sees there is something not quite right with her older sibling and the violent stories he tells.
Wayward Wayne
S1 E18
Wayne Adam Ford's brother, Rodney, tries to stop the madness when his brother's troubled history with women turns into a full-blown murder spree.
Suburban Dad Brian Hummert
S1 E19
Brian Hummert's son David is devastated when his mother is found murdered in 2004, but as the police investigation picks up steam, David realizes that the truth may be even worse.
The San Francisco Witch Killers
S1 E20
Michael Bear Carson's daughter, Jenn, spends her childhood on the run with her mother when Michael and his new wife, Suzan, act strangely and eventually set out to exterminate witches.