A Davenport man on Saturday was convicted on four of five child sex assault charges for raping a 15-year-old girl several times in late 2014.
The Thayer County District Court jury returned the verdicts against Harold L. Stone, 59, plus a fifth guilty verdict for intentional child abuse.
Jurors deliberated about five hours after the five-day trial.
Sheriff's deputies arrested Stone in June 2015 about two weeks after a woman reported the abuse.
In an interview at the Child Advocacy Center in Lincoln, the woman's daughter said Stone raped her once a week through the end of January.
She told a forensic interviewer he threatened to hurt her parents if she told and once said he had mercury and could kills lots of people with it, investigators said in an affidavit to jail Stone. She also said Stone made her take home pregnancy tests and threatened to make her have an abortion if she conceived a child, the affidavit said.
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During their investigation, deputies found a journal at Stone's home with a heading matching the initials of the girl and handwritten notes mentioning conversations he'd had about sex, virginity and "his thoughts about what she needed," the investigator wrote in the affidavit.
Stone remained in the Thayer County jail Monday night and will be sentenced Sept. 1.
Each of the first-degree child sexual assault counts carries a penalty of 20 years to life imprisonment.