History's Greatest Mysteries — Episode 3: The Valentine's Day Massacre

You are watching the episode The Valentine's Day Massacre On February 14th 1929, one of the most shocking murders in mob history goes down in Chicago and becomes known as the Valentine's Day Massacre. The 20s and 30s are full of gangland murders, but the Valentine's Day Massacre is considered the most brutal and the toughest to solve. So who carried out the Valentine's Day Massacre and why?