The disturbing story of a spurned lover who crossed continents to get her revenge on a young couple in West London.

A look at how a preacher's daughter executed her cold, poisonous plans. Plus, a cheating woman heads to the garden shed to find a way to get her revenge.

No one would have picked warm, cuddly grandmother Caroline Grills as a serial poisoner. Her sweet treats were generous, but the poison within brought her victims to a slow, debilitating and often ghastly death.

A gold digger takes out his wealthy lover with a lethal nightcap. Also, a cunning wife gets caught out on her husband's second trip to ER.

A man's interest in chemistry took a dark turn when he began using his family and co-workers as guinea pigs for his deadly experiments.

A community is rocked when it turns out a popular restaurant owner's warm smile and perfect hosting skills are masking an appetite for money and murder.

A seemingly happily marriage meets a nasty end when a man is injured in a freak accident and his wife nurses him to death.

An ex-US navy medic plots against his politician wife. Also, a doting husband is thanked for his kindness with an affair-and a side of poison.

A young mother gets a deadly Valentine's Day surprise from her ex-boyfriend. Also, woman is found dead in the bath-and holes are found in her husband's story.

A devious woman goes as far as to fake her own death to escape justice when both her husband and daughter show symptoms of heavy metal poisoning.

The story of America's first-known case of murder by insulin poisoning, committed by a Californian con-artist who thought he could outsmart the law.

Suspicions rise when a man's fourth and fifth wives die in mysterious circumstances-while he profits from insurance payouts.

A cheating wife teams up with her lover to get her husband out of the picture once and for all.