An arrest affidavit says a rural Colorado sheriff is accused of taking a developmentally delayed inmate to his home, sexually assaulting her and threatening to put her in prison for the rest of her life if she told anyone.

District Attorney Brittny Lewton says Sedgwick County Sheriff Tom Hanna was arrested at his office Tuesday on suspicion of first-degree official misconduct, sexual assault on an at-risk person, sexual assault by a correctional officer and solicitation of prostitution.

An investigator with the district attorney’s office says in the affidavit the inmate said Hanna offered to pay her $60, forced her to strip and sexually assaulted her Aug. 10.

The affidavit made public Wednesday says Hanna denied the allegations and told investigators he was interviewing the inmate after she reported having information about a crime on her cellphone.

It’s unclear if Hanna has hired an attorney.