The Most Prolific Female Serial Killer in UK History

Mary Ann Cotton was known as the black widow.

\the ledgeand, Public domain, via Wikimedia Commons

For more than a century, Mary Ann Cotton was the most prolific serial killer in UK history, until Harold Shipman surpassed her victim count in 2000. She was described as beautiful, charming and ultimately deadly. Gaining her the nickname Black Widow, after the deadly spider.

It has been suggested that Co…