TV Guide Investigation Discovery Monday

The case of Jeffrey Marsalis, who had both charm and good looks but was a sexual predator and would take women on dates and drug them. Two of his victims, JoAnn Buttaro and Jessika Rovell, recall their experiences

The murder of best-selling author Helen Bailey by her partner Ian Stewart, who had earlier helped volunteers in her search. The 51-year-old's body was eventually found dumped in a cesspit beneath the garage of her £1.5million home in Royston, Hertfordshire, alongside that of her dog in July 2016. She had been drugged and suffocated

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

Talented artist Kira and marketing manager Matthew appeared to be happily married. However, a maintenance worker made a grisly discovery, and investigations revealed that all was not well

Late one night in 1993, a California police officer was shot and killed during a routine traffic stop. The only witness was his 12-year-old nephew. However, he was too traumatised to tell police what he had seen

The case of 36-year-old Air Force veteran Michael VanZandt. When he vanished in March 2016, California police suspected a random attacker, but his relatives were haunted by his thrill-seeking when considering his fate

The case of Morris Blankenbaker, who was murdered after becoming ensnared in a love triangle with his wife Dee Ann and her first husband Glynn Moore. Hitman Angelo Pleasant was tasked with conducting the crime in November 1975