TV Guide Investigation Discovery Tuesday

Buying goods from the comfort of home

Buying goods from the comfort of home

Buying goods from the comfort of home

Buying goods from the comfort of home

When three-year-old Briton Madeleine McCann disappeared from her Praia da Luz holiday apartment in May 2007, it shocked the world. Still unsolved, new analysis is made to try to discover the truth about what may have happened to her

The case of former exotic dancer Debra Hartmann, who craved a life of luxury and seemed to have it all - a rich husband, fur coats and expensive car. However, she colluded with lover John Korabik to kill her husband Werner, who was shot dead in June 1982

When detective Molly Daul investigated the brutal murders of two women, she realised she was dealing with a sexual predator who targeted trusting young women. Arrested before he could kill again, his chilling confession remains with the detective to this day

The sexual assault and murder of University of Portland student Kate Johnson in her dormitory room in May 2001. Police weren't sure why an innocent woman was targeted and it took 400 DNA samples and a secret task force to find her killer

The case of former exotic dancer Debra Hartmann, who craved a life of luxury and seemed to have it all - a rich husband, fur coats and expensive car. However, she colluded with lover John Korabik to kill her husband Werner, who was shot dead in June 1982

The murder of Sherman High School graduate Kimberly Dunnachie in Arlington, Texas. Veronica Dunnachie fatally shot her husband Russ and stepdaughter Kimberly in 2014. Kimberly's stepfather and mother, Mike and Dianna Gillum, discuss the incident