A man who was allegedly behind a high-speed crash that left a brother and sister dead has been slapped with a string of charges by police.
Alina Kauffman, 24, and her brother, Ernesto Salazer, 15, were killed when an allegedly stolen Mercedes collided with their Toyota Echo in Heckenberg, in Sydney’s southwest, at about 9.20pm on Friday.
After it struck the Toyota Echo Alina was driving, the Mercedes hit a stationary Toyota RAV4 and flipped onto its side.
A man, 20, who was allegedly driving the Mercedes fled the scene before turning himself into police Liverpool Police Station on Saturday.
He has been charged with driving dangerously and negligently causing death, as well as failing to stop at the scene of a crash and driving while disqualified.

A man has been charged after an allegedly stolen Mercedes collided with another car in a suburban street, killing a brother and sister (pictured, emergency services at the scene of the crash)
The two occupants inside the RAV4 were unharmed.
CCTV allegedly shows the Mercedes travelling at high speed along a residential road just moments before the crash.
Police allege the four occupants inside the Mercedes climbed out of the overturned car and allegedly fled the scene in a Volkswagen Golf.
NSW Ambulance paramedics treated the siblings but they both died at the scene.
Alina had collected her brother from his new job at Kmart and the pair were nearly home when they were struck.
Their mother was inconsolable as she shared her heartbreak on Saturday.
‘My daughter she’s such a beautiful girl, she loves her brother,’ Angelina Kauffman told reporters.
‘And my son he loves his sister. Now my son is gone and my daughter she’s gone. My kids are gone and I have to live the rest of my life with no kids, why? I don’t understand.’
Angelina had arrived at the scene of the crash just minutes after her children were hit.
‘Alina called me and said ”mum I picked up my brother, we are going to get some food and then we are coming home”,’ Angelina said.
‘I said ”are you okay” and they said ”yes mummy”.’


Alina Kauffman, 24, and her brother, Ernesto Salazer, 15, died when the Toyota Echo they were in was struck by an allegedly stolen Mercedes on Friday night

Angelina Kauffman broke down in tears after returning to the scene of a horror car crash that killed her two children in Heckenberg, in Sydney’s southwest
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When she didn’t hear from them in 20 minutes, Angelina and her other child tracked their location down via social media.
‘The police came and told me my kids died. My beautiful kids,’ she continued tearfully.
‘These people hit my kids and left them to die.’
Police are also searching for a person who shockingly shot a video of the dying, or dead, siblings in the aftermath of the crash.
An unknown person approached the crash scene before emergency services had arrived and filmed a six-second video of the smashed-up Toyota Echo.
The camera pans from the crushed front of the vehicle all the way to the back seat, reports The Daily Telegraph.
A person believed to be filming the car is heard saying ‘Oh my god’ in Arabic repeatedly.
The video was posted on social media and shared widely.
Social media images of the siblings and the alleged driver were posted by users in a group chat under the post where the video was uploaded.

Chilling CCTV footage captured the Mercedes allegedly speeding along a road, moments before the horror crash

Police are searching for a person who appallingly shot a video of the aftermath of the horror crash before posting the footage on social media
Police became aware of the footage circulating on Saturday afternoon and have launched an investigation. Detectives are searching on social media for clues.
‘The behaviour of anyone who records images of two critically injured young people is heartless and shameful, and something that any right-thinking member of the community would find appalling,’ Highway Patrol Commander Assistant Commissioner Anthony Boyd said.
‘I cannot imagine how much this will add to the distress already being suffered by the family and friends of these young people.’
The alleged driver of the Mercedes will face Parramatta Bail Court on Sunday.
Another man, 18, who was inside the Mercedes and allegedly drove the Golf away from the crash scene, handed himself into police on Saturday.
He has since been released without charge.
Detectives are still on the lookout for the other two passengers of the Mercedes.
Anyone with information has been urged to contact Crime Stoppers on 1800 333 000.