More than 18 years and possibly life behind bars awaits an East Peoria man with his guilty plea Monday to sexually assaulting a girl for six years before she turned 13.

Roger Stiver, 50, is allegedly a serial child rapist, according to evidence a prosecutor said she would have brought had Stiver’s case gone to trial on charges with 60-year maximum sentences that could have been imposed consecutively.

Stiver kept hope of future freedom alive when he was sentenced to 20 years on three charges of predatory criminal sexual assault of a child under 13 and three more years on two charges of aggravated criminal sexual abuse of a child under 18.

He must serve at least 85 percent of the 20-year term and half of the three years, for a total of 18 1/2 years. He’ll be given credit for 67 days in custody since his arrest.

State law will keep Stiver incarcerated indefinitely if a psychological evaluation reveals him to be a sexually dangerous or violent person.

Stiver sexually assaulted the girl over six years after meeting her in 2011, when she was 7, according to a prosecutor’s court affidavit that was heavily redacted to protect the victim’s identity.

The assaults continued for two more years until May 2016, the affidavit stated. Stiver came under investigation last January, when the girl’s school counselor reported that she had disclosed Stiver’s crimes to her. 

His prosecutor told Tazewell County Circuit Judge Stephen Kouri that the investigation revealed two other girls who described similar sexual assaults by Stiver against them. He was not charged in those cases in return for his guilty pleas. 

Detectives also learned Stiver was under investigation for alleged similar assaults against another girl 15 years ago, for which no charges were filed, the affidavit stated. He has no prior criminal record in Tazewell or Peoria counties.

In an unrelated case, Matthew Bickel, 35, of Peoria, was sentenced Friday to four years of sexual offender probation for sexually abusing a Pekin girl.

Bickel pleaded guilty last March to sexual abuse of a child under 13.

Follow Michael Smothers at Twitter.com/msmotherspekin