Mathew Irving, the man accused of murdering Rebecca Hall, allegedly choked Hall after having sex with her according to a sheriff's report.
Irving, 40, is accused of first-degree murder which carries a life sentence with no possibility of parole.
The two had had an ongoing argument, Irving allegedly told sheriff's deputies, in which he accused Hall of spreading rumors about the married Irving having an affair.
The report states Irving went to Hall's house in east Marshalltown around 10:30 p.m. July 13. The two then drove in Hall's blue 2006 Chrysler minivan to Nicholson Ford Recreation Area east of Marshalltown and had sex. Afterward, Irving said he and Hall argued again culminating with him allegedly using both of his hands to choke Hall. When he left the scene Irving was certain he knew Hall was dead, Irving later told deputies.
The report also states that Irving admitted to relatives that he had killed Hall.
Irving told Judge Kim Riley last Wednesday, "I didn't really mean to kill her" during an initial court appearance.
Irving's next hearing is Friday.