Douglas County Sheriff's Officers have arrested 65-year-old martial arts instructor Charles Niemi on two counts of sexual assault on a child with a pattern of abuse.
The child was reported to be a student at the time of the assault.
Niemi was the head instructor at Spirit Warrior Martial Arts in Centennial and officers have expressed concern that there could be more victims. Black Belt reported that the website included information that Niemi had worked as a counselor with the Division of Youth Services for 13 years. The "about" page has since been removed from the website.
Officers are asking that anyone that believes they may have additional information contact Detective Ducat at (303) 814-7179.
Niemi was booked into the Douglas County Detention Facility. He has since been released. His next court date is scheduled for February 5, 2021.