ST. CHARLES TOWNSHIP – A Kane County corrections officer was charged with engaging in sexual activity with a jail inmate, officials at the Kane County State’s Attorney’s Office announced in a news release.

John H. Johnson, 52, of Elgin, was charged June 23 with criminal sexual assault, custodial sexual misconduct and two counts of official misconduct, all felonies, according to the release.

Kane County State’s Attorney Joe McMahon alleged in charging documents that on June 23, Johnson, a penal system employee, sexually assaulted the female victim, who was in custody in the Kane County jail at the time.

A judge issued a warrant for Johnson’s arrest on July 20 after an investigation by Illinois State Police, the release stated. Johnson surrendered to authorities that evening and was taken into custody.

Johnson remains in the Kane County jail on $150,000 bail, with 10 percent or $15,000, to apply for bond.

The incident was initially reported to Kane County Sheriff Donald Kramer’s office officials on June 25.

Johnson was placed on administrative leave when he reported to work June 26. Johnson was still on administrative leave when the warrant was issued for his arrest.

Kramer asked the Kane County Major Crimes Task Force to conduct the investigation in accordance with Illinois’ Police and Community Relations Improvement Act of 2015, which requires an independent investigation in allegations of misconduct, the release stated.

Johnson has worked as a Kane County corrections officer since February 2004, and that Johnson was assigned to booking and intake at the time of the incident, Kramer stated in the release.

If convicted of the most serious offense, Johnson faces a sentence of 4 to 15 years in prison, the release stated.

“We as public safety officers are obligated to seek justice for all of the public, including those who themselves are accused of compromising public safety,” Kane County State’s Attorney Joe McMahon stated in the release. “I appreciate the hard-working men and women of the Kane County Sheriff’s Office who carry out this important role, and who understand that those who fail to do so must be held accountable.”

“My office does not tolerate officer misconduct and takes all such allegations seriously,” Kramer stated in the release. “I expect all officers and staff to treat all members of the community with dignity and respect. I appreciate the professionalism of the Kane County Major Crimes Task Force in this investigation.”

Johnson is scheduled to appear in court July 26.