A 20-year-old man alleged to be the driver involved in a horror crash in Sydney's southwest that killed a young woman and her teenage brother has been denied bail.
Emergency services were called to Sadleir Avenue in Heckenberg about 9.30pm on Friday to find the pair trapped inside their Toyota Echo after it was hit head-on by a Mercedes allegedly travelling at high speed on the wrong side of the road.
Paramedics treated the 24-year-old woman and her 15-year-old brother but they died at the scene.
A third car was also struck by the Mercedes which police said was reported stolen, but the two occupants inside the stationary Rav4 were unhurt.
Witnesses told police the three young men inside the Mercedes then ran from the scene, before driving off in a Volkswagen Golf.
That car was stopped by police about an hour later and the 18-year-old driver was questioned and released without charge.
A 20-year-old man presented himself to Liverpool police station on Saturday afternoon.
Police later charged him with two counts of dangerous driving occasioning death.
He was also charged with driving in a dangerous manner, negligent driving occasioning death, two counts of failing to stop and assist after vehicle impact causing death, as well as driving while disqualified.
He faced Parramatta bail court via video link on Sunday where he was refused bail.
The matter will return to Liverpool Local Court on Wednesday.
