Authorities believe Justin Pennycook stabbed Dalton Rademacher in the stomach Thursday after Pennycook heard Rademacher had physically abused the mother of Pennycook’s child.

According to a criminal complaint filed with the Rock County District Attorney, Pennycook, 22, of Janesville rode in a car with the woman he shares a child with, the child and another woman to Rademacher’s home Thursday afternoon to confront him and “make sure that (Rademacher) did not damage any of (Pennycook’s) daughter’s property.”

The woman who shares a child with Pennycook is pregnant with Rademacher’s child, according to the complaint.

In statements to police, Pennycook claimed Rademacher, 19, had sent him an electronic message indicating he wanted to fight Pennycook. A woman who was in the car with Pennycook sent a Facebook message to Rademacher asking him to come out of his house at 607 Tudor Drive, Janesville.

Rademacher came out and approached the car as it arrived in the driveway outside the house. Pennycook, riding in the backseat, got out of the car and stabbed Rademacher in the stomach with a folding knife that had a 4- to 6-inch long blade, Rademacher told detectives.

Rademacher was hospitalized at Mercy Hospital and Trauma Center, Janesville, with injuries from the stabbing. Authorities said his condition as of late Thursday had stabilized.

According to the complaint, Rademacher was headed straight for the seat where Pennycook was sitting before Pennycook got out. Right before Pennycook stabbed Rademacher, Rademacher said “Are you sure you want to do this?”

Pennycook stabbed Rademacher once in the stomach, according to the complaint. Rademacher claims Pennycook chased him before fleeing in the car. Pennycook told detectives that Rademacher pulled open the car’s door, and Pennycook immediately stabbed Rademacher once because he “believed there was going to be a fight.”

One of the women in the car said Pennycook did get out of the car. The woman also claimed Rademacher swung at Pennycook before the stabbing, according to the complaint.

One of the women in the car said they fled with Pennycook shaking “really bad.” The woman said they stopped a short time later along Ruger Avenue and that Pennycook got out of the vehicle with two knives. He then walked along the Ice Age Trail north of Ruger Avenue and returned to the car without the knives, the woman said.

The woman later took police to a creek along the Ice Age Trail just north of Ruger Avenue. Police located two knives in the creek, according to the complaint.

According to the complaint, Pennycook faces a charge of first-degree reckless injury by use of a dangerous weapon, a class D felony that carries a maximum prison sentence of 25 years.

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