Definition: someone who has committed murder Level: B1
那个罪犯被确认为大规模谋杀犯。
The criminal was identified as a mass ___murderer.
几周后，警察抓到了我最好朋友的谋杀犯。
A few weeks later the police caught the ___murderer of my best friend.
那个谋杀犯承认了罪行。
The ___murderer confessed to the crime.
