knifeman 
noun (plural knifemen)
A man who uses a knife to commit a crime.A knifeman and thief is today starting a three-year jail term for stabbing a householder in the stomach in a street confrontation over a garage break-in....
- A woman abducted by a knifeman in a busy Bolton street and forced to drive to Leeds was today recovering at home.
- Northumbria Police issued photographs of her injuries as part of a public appeal to track down the crazed knifeman.