A Spring Grove man pleaded guilty on Thursday to one count of aggravated driving under the influence. Steven Knaack, 39, committed the offense on April 24, 2018, in McHenry County. He previously had been convicted of reckless homicide while also driving under the influence, according to McHenry County Circuit Court records. Knaack's second count of aggravated driving under the influence was dismissed as part of a partial negotiated plea.