Jeffrey Williams , 20 , is charged with two counts of first - degree murder , prosecutors says . prosecutors thanks public for leading police to .40-caliber allegedly engaged in shooting . Officers responded after protests in Ferguson ; neither resulted from any Police Department .
Jeffrey Williams , 20 , is charged with two counts of first-degree assault , prosecutor says . Prosecutor thanks public for leading police to .40-caliber allegedly used in shooting . Officers shot after protests in Ferguson ; neither officer from Ferguson Police Department .