An 18-year-old Iowa high school student convicted of sexually assaulting a mentally disabled woman might avoid jail.

According to the criminal complaint, Nicholas Fifield was 17 when he met the 18-year-old woman online. The complaint says they arranged to go to the movies but instead went to his house and had sex, even though the woman said "no" several times.

The Des Moines Register reports (http://dmreg.co/2b1y1eU ) Fifield entered an Alford plea to the misdemeanor count. Under an Alford plea, a defendant maintains innocence but acknowledges prosecutors have enough evidence for conviction.

Prosecutors say they won't fight a probation sentence, but that Fifield, a first-time offender, could get up to two years behind bars at his Oct. 12 sentencing.

Polk County Attorney John Sarcone says probation is "agreeable with the victim's family."

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Information from: The Des Moines Register, http://www.desmoinesregister.com