He was responsible for Thursday's horror crash, veering his family's car into an oncoming lorry which killed both his mum Chrissie and his grandad Lawrence.
And it seems that Emmerdale's Lachlan White will struggle to deal with the guilt of his family's deaths, perhaps leading him to also kill his aunt Rebecca.
In a clip released after Friday's show, Lachlan is briefly seen saying: 'I'm sorry' as he squeezes Rebecca's oxygen tube.
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Killer? Emmerdale's Lachlan White could be set to murder his aunt Rebecca in the coming days, as a teaser clip hints the psycho teen could cut off his aunt's oxygen
Rebecca has been comatose in hospital since the accident, unaware that both her sister and father were killed in the dramatic crash.
The clip also showed Lachlan telling now ex-girlfriend Belle Dingle that they cannot be together, with his black attire insinuating he is attending his family's funeral.
Lachlan confessed his responsibility for the crash to Belle, though did not admit he intended for the car to veer off course.
Friday's episode ended with Belle finding friend Gerry's phone, containing a voicemail Lachlan recorded in the car just seconds before the crash, and though she did not listen to the message, this could hint at Lachlan's true colours coming out.
Suffering: In the clip Lachlan can be seen squeezing Rebecca's oxygen tube as she lies in a coma after Thursday's horror crash
No love: In the clip Lachlan can also be heard telling Belle Dingle they can't be together, with his black attire he could be attending his family's funeral
On edge: Lachlan told Belle that he was responsible for the crash, though did not reveal he intented for his family's car to crash
Whether Lachlan goes through with murdering his aunt remains to be seen, though actress Emily Head, who plays Rebecca hinted that her character would be in a critical state for a long time, telling the Radio Times she has 'lots of lying in bed scenes coming up'.
Discussing the departure of Louise Marwood and John Bowe, she added: 'I came into the family unit that was already set up but they were so welcoming.
'Louise and I are very similar and have the same sense of humour, she instantly became my closest friend on the show. I don't think it's hit me fully they've both gone, it will feel very weird.'
Horror: Emmerdale viewers were left heartbroken on Thursday after Lawrence and Chrissie (pictured) were killed in the horrific car crash
Tragedy: A crazed Lachlan lunged for the wheel and smashed them into an oncoming lorry, causing their car to catapult into a ditch in the horrifying double-bill
Oh no: Lachlan's grandfather Lawrence was flung out of the vehicle and died on the ground, but his terrified mum Chrissie suffered a much more painful death
Lachlan suffered the pain of watching his mum die in Thursday's dramatic scenes, as they shared a gut-wrenching conversation while she was trapped in the car.
The teen had snapped during Saturday's high speed car chase, where the Whites were chasing after Robert Sugden who had snatched baby Sebastian.
During this already tension-filled moment, Lachlan decided to confront Chrissie for her interfering in his relationship with Belle and forcing her to dump him so he would go to Australia with the rest of the family for a fresh start.
Ordeal: While Lawrence and Chrissie died, Rebecca slid into unconsciousness and was left fighting for her life
Lachlan, who was in the front seat next to his driver mother, started reciting a nursery rhyme she said to him in her childhood.
He said: 'Sleep tight, because mummy is here to make all the monsters disappear – but it was you, you were the monster and always were.
'I'm sorry grandad, but we're not going to Australia – make all the monsters disappear!'
Emmerdale continues on Monday 15 January at 7pm on ITV,
Confrontation: An unhinged Lachlan caused the crash after confronting Chrissie for interfering in his relationship with Belle and forcing her to dump him so he would go to Australia with the rest of the family for a fresh start