190920 corn rake murder
Delaware County's county attorney John Bernau (right) questions witness Delaware County Deputy Eric Holub as he hands back a corn rake during the first-degree murder trial for Todd Mullis at Dubuque County Courthouse in Dubuque, Iowa Image Credit: AP

Dubuque, Iowa: An eastern Iowa hog farmer accused of using a corn rake to kill his wife says he didn't do it and doesn't know who did.

The Telegraph Herald reports that 43-year-old Todd Mullis also testified Thursday in Dubuque that he didn't know who used his iPad to conduct internet searches about cheating spouses. He said his wife, Amy, and others knew his password.

190920 murder
Todd Mullis (center) attends his first-degree murder trial at Dubuque County Courthouse. Image Credit: AP

Mullis is charged with first-degree murder in the slaying of Amy Mullis on Nov. 10 at the farm about 40 miles (64 kilometers) west of Dubuque. A prosecutor has said Todd Mullis was irate over his wife's affair.

A state investigator testified that Mullis never denied killing his wife. Mullis said he told the investigator that he wanted Mullis "to confess to something I didn't do."