Chen Ruiqin was a Taiwanese serial killer and one of the country's most infamous criminals. Because of his gambling addiction, he owed debts to loan sharks, and in order to pay them off, he turned towards violence. He murdered his spouse and three children, and fraudulently used their life insurance to amass $38 million NT, for which he was sentenced to 20 years imprisonment. Finally, he was sentenced to death for robbing and raping his girlfriend Chen, from whom he stole millions worth of money. In total, he is suspected of killing 8 people, including two female friends. In the media, he was nicknamed The Chiayi Demon.