A Crystal Lake man faces felony charges after an eight-month investigation into the death of 23-year-old Scott Koivisto. Keith L. Lang, of the 600 block of Savannah Lane, remained at the McHenry County Jail Thursday evening on charges that included drug-induced homicide, an offense typically punishable by as many as 30 years in prison. McHenry County Sheriff's Officers arrested Lang, 30, at his home Wednesday.