He was jailed on suspicion of kidnapping and homicide.
Jayme Closs was found alive by the suspect's neighbours on Thursday. Jayme's grandfather Robert Naiberg said in a telephone interview Saturday that the only thing the family knows for sure is that no one knew Patterson.
Jayme's cousin, Angela De Andriano, is managing the gofundme account Jayme is Home - Help Heal her Heart.
"We are still mourning the loss of long-time Jennie-O family members Jim and Denise, but our entire team is celebrating with the community, and the world, that Jayme has been found", Mr Lykken said. "(Jayme) don't know him from Adam. [But] he knew what he was doing.
Here's what we know so far about the case.
Mrs Kasinskas told the Press she had not seen him on their street or in town since high school, describing him as "a quiet kid".
Patterson's lawyers Charles Glynn and Richard Jones said in a statement they consider the situation "very tragic" and that they are relying on the court system to treat their client fairly. Charges are expected against Patterson on Monday, when he is expected to make his initial appearance in court.
The news that Jayme was safe set off joy and relief in her hometown of Barron, population 3,300 and about 60 miles (100 kilometres) from where she was found.
It was her house Jayme Closs was brought to after she escaped to seek help.
An aunt says a Wisconsin teenager who was found alive this week nearly three months after vanishing from her home had "a pretty good night sleep" on her first night back with family.
Smart called Closs fearless, strong, and a powerful survivor - but also says there is a long road ahead.
Another aunt, Sue Naiberg Allard, posted that Jayme got "the most awaited hug ever" when she returned home.
Jayme told one of the people in Gordon who took her in that she had walked away from a cabin where she had been held captive.
"She said that this person's name was Jake Patterson, 'he killed my parents and took me,"' said another neighbour, Kristin Kasinskas. "She did not talk about why or how. She said she did not know him".
Patterson was arrested Thursday in Gordon, Wisconsin - shortly after authorities say Jayme was able to escape from a home at which she was being held when Patterson is believed to have been out.
Fitzgerald says authorities don't know of any social media connection between Patterson and the girl.
"I don't understand it yet myself", Fitzgerald said. "I was in child protection [services], so I believe my CPS personality just turned on", Nutter told the Milwaukee Journal Sentinel on Friday. "Either digitally or physically, or that he knew them".
He wonders whether Patterson was somehow stalking Jayme.
Jeff Closs, Jayme's uncle, said that the teen's return was shocking. She escaped Thursday from a northwestern Wisconsin cabin where she'd been held. Law enforcement barricades blocked the road leading to the property Saturday.
Also on Friday, a close friend of Smith told PEOPLE she is "beyond ecstatic" about Jayme's homecoming. No one pressed her to talk, he said, adding that Federal Bureau of Investigation agents and doctors advised them to let her speak when she's ready.
Patterson, who was unemployed, remained largely an enigma Saturday.
Despite Erik Patterson's criminal record, few across the township seem to have heard of his family.
The president of the Jennie-O Turkey store in Barron, where James and Denise Closs had worked for decades, said Patterson had been an employee there for a single day three years ago.
Detectives pursued thousands of tips, watched dozens of surveillance videos and conducted numerous searches in the effort to find Jayme.
After 87 days, 13-year-old Jayme Closs has been found alive in rural Wisconsin.