Zhao Zhihong (born September 5, 1972 – July 30, 2019), nicknamed the "Smiling Killer" and "Demon", was a Chinese serial killer and rapist.
He admitted to committing a total of 20 serious crimes between 1996 and 2005, including raping and killing at least 6 women in Ulanqab and Hohhot in Inner Mongolia.
He was executed in 2019, following a court verdict.