Patterson sat expressionless during the court appearance, which he made via video feed from the county jail. He spoke only to acknowledge that his name and address were correct on paperwork and that he agreed to waive a speedy preliminary hearing. The judge set bail at US$5 million (AU$6.9 million).

Patterson went to the home twice intending to kidnap Jayme, but broke off one attempt because too many cars were in the driveway and called off another because the house was too active, the complaint said.

On the night she was abducted, Jayme told police, she was asleep in her room when the family dog started barking. She woke her parents as a car came up the driveway.

She and her mother, Denise, hid in the bathroom, clutching one another in the bathtub with the shower curtain pulled shut. Her father, James, went to the front door. They heard a gunshot, and Jayme knew that James had just been killed, according to the complaint.

Denise Closs started to call 911. Patterson broke down the bathroom door. Jayme said he was dressed in black, wearing a face mask and gloves and carrying a shotgun.

Patterson told her mother to hang up and ordered her to tape Jayme's mouth shut. He told detectives that Denise Closs struggled with the tape so he wrapped the tape himself around Jayme's mouth and head. He then taped her hands behind her back and taped her ankles together before pulling her out of the bathtub and shooting her mother in the head.

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He dragged Jayme outside, nearly slipping in blood pooled on the floor. He threw her in the trunk and drove off, pausing to yield to three squad cars speeding toward the house with flashing lights, the complaint said.

Patterson took her to a cabin that he said was his, ordered her into a bedroom and told her to take off her clothes and get dressed in his sister's pyjamas. He then threw her clothes into a fireplace in the cabin's basement.

Whenever he had friends over, he made clear that no one could know she was there or "bad things could happen to her," so she had to hide under the bed. He sealed her under the bed with tote boxes and weights so she could not crawl out, according to the complaint. She had to stay under the bed whenever he left the house, sometimes going for hours without food, water or bathroom breaks.

When his father visited, Patterson told investigators, he turned up the radio in the bedroom to cover any noise she might make.

He said he assumed he had gotten away with the slayings and kidnappings after two weeks went by. He told detectives that on the night of the kidnapping he put stolen license plates on his car and removed an anti-kidnapping release cord from his trunk. He also shaved his head so he would not leave any hair behind and chose his father's Mossberg shotgun because he thought it was a common model that would be hard to trace.

Patterson, who has no criminal history in Wisconsin, was described by people who knew him as a quiet and good student who participated in quiz bowl in high school. He wrote in his high school yearbook of wanting to join the Marines. On Monday, a spokeswoman for the Marines said Patterson lasted just a little more than month in the corps before washing out in October 2015.

Patterson told detectives he worked at the Saputo Cheese Factory near Almena for just two days before quitting. The company did not immediately respond to messages from The Associated Press.

His defense attorneys, Charles Glynn and Richard Jones, said they believe Patterson can get a fair trial, but they are not sure where.

"It's been an emotional time for this community and a difficult time for this community. We don't take that lightly. But we have a job to do in protecting our client," Jones said.

Patterson's relatives, including his father, Patrick, declined to comment after the hearing.

After Jayme's disappearance, police collected more than 3500 tips, but no hard leads emerged.

Then on Thursday, a woman walking her dog spotted Jayme along a road near Gordon, a town about an hour's drive north of Barron. The woman said the girl begged her for help, saying Patterson had been hiding her in a nearby cabin and that she had escaped when he left her alone.

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Neighbours called 911, and officers arrested Patterson within minutes.

The New York Post published photos of the cabin Monday. The images showed a shabby living area with a couch, refrigerator, an old television set and an unfinished ceiling. Exterior photographs show a lean-to loaded with firewood, a three-car garage and an empty box of adult female diapers in a trash can. A sign over the cabin's front door reads "Patterson's Retreat."

Authorities have not said whether Jayme was sexually assaulted. The complaint does not charge Patterson with any form of sexual assault. The narrative in the document does not say what Patterson did with her.

Prosecutors said they expect to release more information on the case before Patterson's next hearing on February 6 and that additional charges could be brought in the county where Jayme was held. They gave no details.

Barron County District Attorney Brian Wright declined to say any more about Patterson's motive after the hearing. But he praised Jayme for surviving.

"She's 13 years old, and if you read the criminal complaint, you can see the amount of control that he was exerting over her. And at some point, she found it within herself at 13 years old to say, 'I'm going to get myself out of this situation.' I think it's incredible."

AP