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Brendan Dassey worried about getting his uncle Steven Avery into trouble after giving evidence to police in the Teresa Halbach murder probe without a lawyer present.

And in this footage - some of which didn't make it into the hit show - schoolboy Brendan also asks if he can speak to his girlfriend because he had planned a date before being taken into custody.

The 16-year-old was told his confession would "work in his favour" by police even though he had no one to advise him on how to deal with interrogation methods.

In an emotional conversation with his mother Barbara Tadych - who had been allowed access to him while he was detained - Brendan becomes anxious that the story he'd told police would be different from his uncle's version of events.

He says: "I have a question, what happens if he [Steven] says the story is different and he says he admits to doing it?"

His mother Barb responds: "What do you mean?"

Brendan answers: "If his story is different or I didn't do nothing or something."

Barb says: "Did you?"

(Image: Youtube/Netflix)

Brendan: "Not really."

Barb says: "What do you mean not really? What do you mean by that, what do you mean by that Brendan?"

Brendan was never called as a witness at the Steven Avery trial largely in part down to his 'unreliability' as a witness but his testimonies added fuel to the fire.

And while it was suggested in the Netflix documentary that Brendan was coerced into making a confession - this recorded police footage shows he was told that cooperating would help - even though he ended up with a life sentence.

Brendan's relationship with his unnamed girlfriend was not featured in the show - but it shows he had no idea his statement to the police would end up with his lengthy imprisonment.

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Dassey was sentenced to life in prison , with a chance for early release in 2048, following his conviction and is currently in Green Bay Correctional Facility in Green Bay, Wisconsin.

This footage also shows police planned to take the clothes Brendan was wearing on the night he allegedly raped and killed Teresa with his uncle Steven.

But those elements did not make it into the show.

Read more:Making a Murderer: Steven Avery writes letter to fans of Netflix documentary series

Police left Brendan in a room to contemplate what he'd told police officers for 48 minutes before he told he was to be arrested.

He is seen eating a sandwich, chewing his fingernails and falling asleep before police eventually come into the room and explain to him that he is going to be incarcerated.

Seemingly unaware of the magnitude of his situation he asks to call his "girlfriend."

(Image: 12 WISN ABC)

Dassey also asks to speak to his mum Barb who appears to be worried that her son had been keeping "secrets."

She also notes that her son does not have access to a lawyer - and is worried she may have to sell her house to pay for one.

She then goes on to say she believes Steven planned to involve Brendan in the crime saying: "He told me not all of my kids would graduate high school."

TRANSCRIPT

In this footage Brendan appears unaware of the seriousness of the allegations against him.

Officer 1: "What do you think is going to happen, what do you think should happen right now?

Brendan: "I don't know."

Officer: "You know obviously that we're police officers and because of what you told us - we are going to have to arrest you, did you kind of figure that was coming? For what you did, we can't let you go right now, the law will not let us and so you are not going to be able to go home tonight.

Brendan "Does my mom know?"

Officer: "Your mom knows.

Officer 2: "Your mom is here ok, would you like to talk to her?"

Brendan: "Yeah."

Officer: "Before we bring her in do you have any other questions right now, you do understand that you are under arrest now?"

Brendan: "So could I call my girlfriend and tell her that I couldn't come today?"

Officer: "We will give you an opportunity to do that ok?

"I mean honestly after telling us what you told us you kind of figured this was coming yeah?"

Brendan: "Is it only for one day?"

Officer: "We don't know that at this time, but let me tell you something Brendan you did the right thing, ok? By being honest you can at least sleep at night now as I am sure you had some difficulty with that.

"So you did the right thing here by telling us what happened.

"Just remember that in the future you need to be honest.

"Your cooperation in this is going to work in your favour.

"I can't say what it's going to do or where it's going to end up but it's going to work in your favour and we appreciate your continued cooperation.

"We talked to your mom about about going to the house and going into the house and getting a few items and about you going out there with us and her and pointing out those areas that we wanted you to point out. Is that ok?"

Officer 2: "Do you know where those red shoes are that you were wearing that day?

Brendan: "I think they are in the closet."

Officer: "And what about the jacket?"

Brendan" "In the closet."

Officer: "Alright we will have your mom come in for a few minutes."

Read more:Making a Murderer: Startling new evidence 'could hold key to Steven Avery getting a retrial'

Brendan's mum Barb enters the room and immediately cuddles her son - she appears to have been told by officers that he has confessed to the crime.

She also says she is concerned that Brendan has no lawyer and tells him that he should have walked out of the trailer asking Brendan if Steve forced him.

Barb says: "What did he do to you to make you do it?

"Did he force you to do it? Huh?

Brendan responds: "I didn't want to."

Barb says: "Are you regretting it now, you had your whole life ahead of you Brendan. Just because he's so demanding doesn't mean you have to do the stuff he says. Right?"

Brendan responds: "Where am I going?"

(Image: Netflix)

Barb says: "Where do you think you're going?

Brendan responds: "I don't know."

Barb says: "Your going to juvie. That's where you're going to the juvie jail. About 45 minutes away.

Brendan: "But I have a question, what happens if he says the story is different and he says he admits to doing it?"

Barb: "What do you mean?"

Brendan says: "If his story is different or I didn't do nothing or something."

Barb says: "Did you?"

Brendan: "Not really."

Barb says: "What do you mean not really? What do you mean by that, what do you mean by that Brendan?"

His mum then goes on to wonder what had previously happened during the interview and asks the police: "Were you pressuring him, when you were talking to him?

Later in this recording she says: "He [Steven] did tell me one time that probably one or two of my kids would not graduate this was before this even happened,

"He must have had it all planned. You don't know how much hatred I've got right now."