The Most Prolific Female Serial Killer in UK HistoryMary Ann Cotton was known as the black widow.Sam H ArnoldFeb 05, 2021∙ Paid11Share\the ledgeand, Public domain, via Wikimedia CommonsFor 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.…Continue reading this post for free, courtesy of Sam H Arnold.Claim my free postOr purchase a paid subscription.PreviousNext