The Major Case Squad has been activated after a man was shot to death in north St. Louis County Wednesday afternoon.

Police say they were called to the 7600 block of Bermuda at 12:52 p.m. Eighteen detectives with the Major Case Squad are investigating the homicide.

The victim has been identified as 30-year-old Markquett Nunn.

Witnesses say Nunn was doing yard work in the front of his home when the suspect came from the back of the home and shot him.

The suspect is still on the run. Police have not released a description of the suspect or a motive.