Penny kills her only daughter when her boyfriend, in a fit of anger, tells her she must choose between them-and she does.

These deadly women murder quietly and quickly and in most cases get away with it for many years, until they strike again and a gruesome pattern emerges.

Want to know whatever happened to Jane Andrews, this Deadly Woman? Pat Lalama fills you in on the details.

Lizzie Borden, American most infamous murderess. Born into a wealthy respected family, Lizzie was a quiet, Sunday school teacher - that is until she took an ax and hacked her stepmother and and father to death. Or did she?

Beauty queen Darlene Doskocil always wanted the easy way out.

The path towards revenge can sometimes lead to murder. It can be quick, fiery and violent. When these women were crossed, they didn't take it lying down. Murder was their answer.

Some women can’t resist boy toys. But fur flies when these women reveal they're "Killer Cougars.” 39-year-old Dr. Shirley Turner exposes some skeletons in her closet: a history of affairs with younger men all ending in rejection that Shirley could not handle.

Egyptian born model and nanny Omaima Aree said, "Nothing tastes as good as the man I married." She killed dismembered, ground up, cooked and ate her husband of two months.

Susan Eubanks killed her four sons in an execution style slaying to punish her husband for leaving her.

Brittany Norwood has a history of stealing, she murders her work colleague after being caught stealing from the store.

From Valerie Parashumti to Diana Downs, we take a closer look at why women kill.

Betty Neumar married 5 times over a 50 year period. Each marriage ended in a suspicious death.

Medicine can do a lot of good, but in the hands of a deadly woman, bad medicine can be devastating.

Are they lovely or lethal? Catch an all new season of Deadly Women, Thursdays on Investigation Discovery.

Desperate for money to feed her drug addiction Maria del Rosio Alfaro murders a nine year old girl she's watching so she can steal money from her house.

Griselda Blanco was a woman to be reckoned with in Miami as leader of a drug ring. She shows no mercy in having her own thugs taken out-even when the 6 year old son of her henchman is accidentally killed.