SIOUX FALLS, S.D. (MITCHELLNOW) Sioux Falls police say a man is facing aggravated assault charges after threatening to kill his mother and brother. It started when an employee spotted Baruti Ndadyo going through a vehicle in the 4300 block of East 12th Street. Police spokesperson Sergeant Aaron Benson says when the worker confronted him, Ndadyo assaulted the employee.  Investigators say Ndadyo also threatened others nearby with a pickaxe before leaving the scene. Officers arrested him a short time later.