GREEN LAKE COUNTY, Wis. (CBS 58) -- The Green Lake County Sheriff's Office held a press conference Wednesday morning, Dec. 11, with an update on the Ryan Borgwardt case.

As of Tuesday evening, online records showed Borgwardt was in custody at the Green Lake County Jail. 

The sheriff's office confirmed Borgwardt arrived on US soil Dec. 10. He was then booked into the correctional facility and is awaiting an initial court appearance.

Authorities say Borgwardt came back to the United States voluntarily. They say they are still putting together where he was, and who he was with.

They did not indicate where exactly Borgwardt came from, simply saying, he "got on an airplane and landed in the United States."

When asked what compelled Borgwardt to return, sheriff's officials said, "His family, I guess."

They say the DA's office will review possible charges, such as obstruction. 

"We didn't give up," Green Lake County Sheriff Mark Podoll said. "And we can stand here today feeling relieved."

The search for Ryan began after he went kayaking on Aug. 11 and never returned home.

After searching the lake for 54 days without finding his body, investigators asked Borgwardt's wife if they could check his laptop.

The story started to unravel when they found Borgwardt communicated with a woman from Uzbekistan and looked into moving money into foreign accounts.

They eventually got in touch with him overseas, and he sent them a video to prove he was safe.

From Europe, he admitted to investigators how he disappeared, saying he overturned the kayak and ditched his phone and wallet in the water. Then he rode a bike to Madison, where he hopped on a bus to Detroit. From there, he got into Canada using a second passport, then caught a flight to Europe.

The sheriff's office says Borgwardt's initial appearance could take place as soon as Wednesday. 

This is a developing story. Stick with CBS 58 for updates on-air and online.