Brian E. Tiedemann, 21, of Wonder Lake, Illinois was arrested on Fri., Jan. 22, and charged with multiple counts of predatory criminal sexual assault and aggravated criminal sexual assault.


The McHenry County Sheriff’s Office took a report of a possible sexual abuse to a juvenile in unincorporated Wonder Lake, which began the investigation. The investigation led detectives to Brian Tiedemann as a person of interest.


On Jan. 22, the Sheriff’s Office received additional information from the Crystal Lake Police Department that Tiedemann may be a person of interest in a sexual abuse case they were investigating. Following witness statements and interviews, Tiedemann was arrested and charged with 16 counts total (listed below) as a direct result of the allegations that occurred in unincorporated Wonder Lake.


The Sheriff’s Office investigation is still ongoing and more charges may be forthcoming. Anyone with information that may assist police in their investigation are encouraged to contact the McHenry County Sheriff’s Office investigations Division at 815-334-4750.


Brian E. Tiedemann, 21 was arrested and charged with 5 counts of Predatory Criminal Sexual Assault and 11 counts of Aggravated Criminal Sexual Abuse.


Tiedemann is currently at the McHenry County Correctional Facility. His bond has been set at $750,000.

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