Inside dark life of teenager, 17, accused of mowing down Brisbane couple in ...

A teenage driver accused of murdering a young couple as they walked their dog on Australia Day had shared boastful photos online of him posing next to a machete and handling large sums of cash. 

The 17-year-old was allegedly high on drugs and driving a stolen Toyota 4WD when he struck Matthew Field, 37, and his girlfriend Kate Leadbetter, 31, at Alexandra Hills in Brisbane's south-east on Tuesday evening. 

Ms Leadbetter was six months pregnant at the time of her death.

The teenager - who cannot be identified - was remanded in custody on charges including two counts of murder at Brisbane Children's Court on Wednesday.   

Kate Leadbetter, 31, and Matthew Field, 37, were killed when they were allegedly hit by a stolen Toyota 4WD driven by a 17-year-old driver on Tuesday - while their dog Frankie who the couple had been walking, fled from the scene

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Kate Leadbetter, 31, and Matthew Field, 37, were killed when they were allegedly hit by a stolen Toyota 4WD driven by a 17-year-old driver on Tuesday - while their dog Frankie who the couple had been walking, fled from the scene

The teenager had shared boastful photos online of him posing next to what appeared to be a machete

One photo showed him with a large watch on his wrist

The teenager had shared boastful photos online of him including one posing next to what appeared to be a machete

Images have meanwhile surfaced from the teenager's Instagram account showing him posing with a bundle of $50 notes.

In others, he can be seen posing with a drink in his hand next to a BMW and beside what appears to be the handle of a machete.

Some showed him with a bumbag around his waist or with a large watch on his wrist.  

The Courier Mail reports the teenager was on bail for 50 unrelated offences at the time of the crash. 

The photos surfaced as shocking footage emerged online allegedly showing a teenage driver taunting another car as he waited at a red light - just minutes before the alleged murder.

In one photo, the accused stood shirtless holding a large bundle of $50 notes in front of the camera

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In one photo, the accused stood shirtless holding a large bundle of $50 notes in front of the camera

The 17-year-old (centre) was reportedly on bail for 50 unrelated offences at the time of the crash

In one photo, the accused teenager can be seen posing with a drink in his hand next to a BMW

In one photo, the accused teenager (left) can be seen posing with a drink in his hand next to a BMW (right)

The teen had pulled up next to the i30 at a red light and made rude gestures out the window at another driver and his disabled son, before veering into their side and then fleeing at speed.

Chris and Angela Fleming were also waiting at the traffic lights just behind the i30 and captured the whole alleged road rage incident with the teenage driver on video.

In the footage - which has been shared 6,000 times on Facebook - the teen can be seen making rude gestures out the window.

Ms Leadbetter (right) was six months pregnant and excited to start a family with her long-term boyfriend Mr Field (left)

Ms Leadbetter (right) was six months pregnant and excited to start a family with her long-term boyfriend Mr Field (left) 

The Toyota LandCruiser that the teenager was allegedly driving lies damaged at the scene of the horror crash around 5.30pm on Tuesday. Moments earlier it had allegedly been used in a road rage incident on a nearby road

The Toyota LandCruiser that the teenager was allegedly driving lies damaged at the scene of the horror crash around 5.30pm on Tuesday. Moments earlier it had allegedly been used in a road rage incident on a nearby road

'He's a d**khead,' Mrs Fleming can be heard to say on the video.

When the light turns green seconds later, the i30 hurries off in an evident attempt to avoid the abusive teenager.

But he soon also speeds up and veers into the car's rear left door, causing it to spin.

Watching the carnage unfold in front of her, Mrs Fleming lets out a petrified scream before urging her husband to 'follow'.

Ms Leadbetter and Mr Field were taking their dogs Frankie and Django for their usual afternoon walk when they were struck

Ms Leadbetter and Mr Field were taking their dogs Frankie and Django for their usual afternoon walk when they were struck 

As they drive after the two cars the pair called Triple Zero and ask for police, before pulling up behind the Hyundai i30 driver who had stopped by the road side.

Police allege just minutes later the teenager sped through a red light, ploughed into another vehicle and then veered off the road - hitting and killing Ms Leadbetter and Mr Field. 

Ms Leadbetter and Mr Field were taking their dogs Frankie and Django for their usual afternoon walk when they were struck.

Frankie (pictured) survived the horrific crash but fled the scene in terror immediately after. He was found by a large search party in dense bushland the next morning

Frankie (pictured) survived the horrific crash but fled the scene in terror immediately after. He was found by a large search party in dense bushland the next morning

Ms Leadbetter and Mr Field's dog Frankie is carried out of bushland on Wednesday morning at the end of a long search by locals, friends and family to find the dog

Ms Leadbetter and Mr Field's dog Frankie is carried out of bushland on Wednesday morning at the end of a long search by locals, friends and family to find the dog

But in a tragic twist of fate, friends of the pair have revealed they went on a different route to normal that day. 

Queensland Police Assistant Commissioner Brian Codd said even the most hardened members of the force had been rocked by the tragedy. 

'We, the police department, along with our community, are hurting. Dealing with this sort of tragedy - which is preventable - is incredibly frustrating,' he told the Today show on Thursday. 

'I'm limited by law [by what I can say]. I'm not going to compromise our investigation and prosecution.

'The reality of it is... It's something that does my head in.  

'I am angry. I'm angry and my people are angry. They're frustrated and they're heartbroken... Can you imagine going and telling a family about the loss of a loved one? It has an impact on our people but we're providing them enormous support.' 

Locals banded together to hold a vigil at the intersection of Finucane and Vienna Road - where the couple tragically lost their lives

Locals banded together to hold a vigil at the intersection of Finucane and Vienna Road - where the couple tragically lost their lives

Loved ones console each other during the vigil for the young couple on Wednesday night

Loved ones console each other during the vigil for the young couple on Wednesday night

Today host Karl Stefanovic said the story of the 'beaming and beautiful' expectant parents breaks his heart. 

'Just at Christmas. Holding a picture of their unborn baby. Their whole lives ahead of them,' he said on Thursday morning after learning of the couple's walking route. 

'But in one horrifying moment on a bayside suburban street that was ripped apart.

'As they left home to walk their dog, we learn this morning they made a fateful decision, turning left when they

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