Vigil for Kate Leadbetter and Matty Field who were killed in horror car crash ...

A heartbroken community have farewelled a young couple in a moving vigil just a day after they were killed by an allegedly out-of-control teenage driver in Brisbane's east.

Kate Leadbetter, 31, and her boyfriend Matthew Field, 37, were about to become parents for the first time before a 17-year-old boy - allegedly driving a stolen Toyota 4WD - smashed into them in Alexandra Hills on the afternoon of Australia Day.

They'd been taking their dogs out for a walk at around 5.30pm on Tuesday when they were both struck by the vehicle.

Despite the best efforts of emergency services, the parents-to-be died at the scene.

The 17-year-old driver - who was allegedly on drugs and driving a stolen Toyota 4WD when he hit Ms Leadbetter and Mr Field - has since been charged with two counts of murder.

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Locals banded together on Wednesday night to hold a vigil on the corner of Finucane and Vienna Road - the intersection where the couple tragically lost their lives. 

Those attending have been told to bring a light 'to shine for those three beautiful sounds lost to a senseless tragedy'. 

Kate Leadbetter, 31, and her boyfriend Matthew Field, 37, were killed during a horror car crash in Alexandra Hills, in east Brisbane on Tuesday around 5.30pm

Kate Leadbetter, 31, and her boyfriend Matthew Field, 37, were killed during a horror car crash in Alexandra Hills, in east Brisbane on Tuesday around 5.30pm

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

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

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

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

A mourner lays a bouquet of flowers down at the intersection where Ms Leadbetter and Mr Field were killed

A mourner lays a bouquet of flowers down at the intersection where Ms Leadbetter and Mr Field were killed

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The shattered aunt and uncle of Ms Leadbetter, Danielle and Jason Leadbetter (pictured at vigil), said they would always remember their 'beautiful' niece

The shattered aunt and uncle of Ms Leadbetter, Danielle and Jason Leadbetter (pictured at vigil), said they would always remember their 'beautiful' niece

The shattered aunt and uncle of Ms Leadbetter, Danielle and Jason Leadbetter, said they would always remember their 'beautiful' niece.

'I remember Kate as my flower girl at my she was just so joyful,' Ms Leadbetter told the Courier Mail.

'It's hard to believe that someone doing such a selfish act could take someone's life.

'She was just everything that is beautiful in this world so Queenslanders posting on social media, I'm reading it, you're angry, let's change the laws, take this anger and challenge it into something positive so it's not your child that you are burying one day.'

The publication also reported the teen driver was on bail for driving offences including evading police. 

Countless bouquets of flowers and teddy bears were laid at the scene while loved ones bravely spoke out about the loss of the couple.

Ms Leadbetter, who was six months pregnant, is understood to have been working as an interior stylist while her partner worked in fabrications.  

The young couple had recently shared a photo of their baby's ultrasound as they stood proudly in front of a Christmas tree.

Queensland Police are now investigating the possibility of laying more charges against the teenager over the death of Ms Leadbetter and Mr Field's unborn baby.

Flowers, teddy bears and letters were left at the intersection where a young couple were killed on Australia Day

Flowers, teddy bears and letters were left at the intersection where a young couple were killed on Australia Day

Kate Leadbetter (right) was six months pregnant and excited to start a family with her long-term boyfriend Matty Field (left) when they were rundown and killed in Brisbane on Tuesday

Kate Leadbetter (right) was six months pregnant and excited to start a family with her long-term boyfriend Matty Field (left) when they were rundown and killed in Brisbane on Tuesday

'That's certainly something we'll be considering as part of the ongoing investigation,' Queensland Police Assistant Commissioner Brian Cold said on Wednesday. 

'Here's two people going about their business innocently on Australia Day, walking their dogs, they should be entitled to do that.

'To have them ripped away from their families is an absolute tragedy, and I can assure you it's impacted very heavily on the first responders and witnesses who faced that.' 

The 17-year-old had allegedly been driving erratically through the intersection when he ploughed into a two truck.

His car then began to roll and moments later collided with the couple walking their two dogs.       

Ms Leadbetter, 31, and Mr Field, 37, died instantly, while their dog Frankie who they had been walking, fled from the scene

Ms Leadbetter, 31, and Mr Field, 37, died instantly, while their dog Frankie who they had been walking, fled from the scene

The 17-year-old from Waterford West was due to front Brisbane Children's Court on Wednesday but chose not to appear.

At a hearing in his absence he was remanded in custody. The teen is understood to have been on bail for 50 unrelated offences when the crash occurred.

Outside court the teen's lawyer Patrick Horgan said it had been a 'very traumatic experience for everyone involved'.

As their families struggle to come to terms with the tragedy, the pregnant woman's sister shared the heartbreaking photo showing Ms Leadbetter and Mr Field in happier times over Christmas.

Arm-in-arm and smiling, Mr Field held up the framed photo of the ultrasound, while in the background was a display that read: Santa baby.

'Here's two people going about their business innocently on Australia Day, walking their dogs, they should be entitled to do that,' Queensland Police Assistant Commissioner Brian Codd said of the deaths of Mr Field and Ms Leadbetter

'Here's two people going about their business innocently on Australia Day, walking their dogs, they should be entitled to do that,' Queensland Police Assistant Commissioner Brian Codd said of the deaths of Mr Field and Ms Leadbetter

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

Frankie (pictured) survived the horrific crash but fled the scene in terror immediately after

Frankie (pictured) survived the horrific crash but fled the scene in terror immediately after

Ms Leadbetter and Mr Field had been dating for more than four years and were expecting their first child

Ms Leadbetter and Mr Field had been dating for more than four years and were expecting their first child

Ms Leadbetter's sister Kimberley shared the photo to Facebook on Wednesday in a bid to help the dozens of locals who spent the morning searching for missing pooch Frankie, the couple's beloved pet. 

The dog fled the scene in the aftermath of the crash leading some locals to search well into the night, before continuing on with their hunt on Wednesday morning.

But a large search party discovered Frankie alive and well in bushland about 11.30am AEST on Wednesday.

He was carried out of the dense bushland by the search party and will be taken to a local vet for a check up.

A GoFundMe page has now been set up to help

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