DNA evidence may have finally revealed the identity of the Jack the Ripper, the infamous serial killer who murdered at least five women in London in 1888. British researchers used forensic DNA testing on blood and semen found on a shawl near the body of the fourth victim, Catherine Eddowes, and it matched one of the main suspects, 23-year-old Polish barber Aaron Kosminski, who apparently vanished after the murders. Researchers were able to compare the DNA to samples taken from living descendants of Kosminski.