South Korea's deadliest serial killer beat sex workers with hammer after being dumped
![South Korea's deadliest serial killer beat sex workers with hammer after being dumped](https://i2-prod.dailystar.co.uk/incoming/article30452133.ece/ALTERNATES/s615/0_MAINSOCIAL.jpg)
Yoo Young-chul is believed to have killed at least 26 people, all either rich people or female sex workers in his brutal murder spree that saw him dubbed ‘The Raincoat Killer’