Making a Murderer 's Brendan Dassey is "scared" of leaving prison after a decade behind bars, his mum has admitted.

The 26-year-old was ordered to be released from jail by a federal judge after his 2007 conviction for the murder of Teresa Hallbach was overturned and is expected to return to his family on or before November 12.

Speaking about Brendan's release his mum, Barb Tarch admitted while he was "excited" to get out, there's some trepidation after spending so long locked up.

"He is very excited to get out of there and he knows he doesn't belong in there," she explained to the Mail Online .

"But I think he's scared a little bit of going into the outside world, it's changed big time."

(Image: Twitter @averydassey) (Image: Twitter @averydassey)

Brendan was aged just 16 when he was sentenced to life in prison, with no parole for 41 years for the murder and sexual assault of Teresa Halbach on Halloween 2005, along with his uncle Steven Avery.

Aside from getting used to life as a free man, Brendan will also have to contend with the international fame Netflix's Making A Murderer brought him.

Barb confirmed that Brendan, who has an IQ of 70, will be receiving counselling for the ordeal he has gone through.

She said: "He's going to get counselling, I'm getting help from his attorney in having it all set up for when he's released.

"He didn't belong in there ten years ago, he doesn't belong there now. There can't be a retrial. They have nothing whatsoever. His confession was false to begin with."

After years of battling against the murder conviction, last month Milwaukee Federal judge William E. Duffin ruled to overturn the conviction after granting his petition for a write of habeas corpus.

The Wisconsin Attorney General was given 90 days to appeal the decision and if not Brendan will walk free.