27/09/2017 12:05 PM AEST | Updated 27/09/2017 12:08 PM AEST

36-Yr-Old Denied Bail Over Fatal Sydney Hit-And-Run

The lethal crash happened at Milperra.

Paramedics couldn't save Natasha Gadd.

A motorist charged over the hit-and-run death of Sydney teenager Natasha Gadd has been refused bail in court.

Gadd, 19, was shockingly killed in the early hours of Sunday morning when she was hit by a white ute on Henry Lawson Drive at Milperra, in the city's southwest.

On Wednesday, 36-year-old Seng Hong Mam faced Fairfield Local Court court over the death, charged with several offences including dangerous driving causing death, the ABC reports.

It reports that Mam was refused bail, with prosecutors describing the alleged perpetrator as an "extreme flight risk".

He was reportedly driving on a suspended licence at the time and was arrested following a three-day search by police.

Earlier on Wednesday, Detective Inspector Katie Orr said police would allege the teen was hit while walking with friends.

"We hope this provides some closure," she told reporters.

"They (the family) are aware of the arrest, and although it won't bring their daughter back, hopefully it will provide some closure for the family.

"It is always traumatic when someone loses their life and the investigators have put a massive amount of work in which has led to this early arrest."

In the wake of the tragedy, Gadd's family labelled the driver a "coward" for not coming forward.

"My baby's never coming home," Natasha's mother Charmain Gadd was quoted as saying at the time.

"He left my baby for dead on the side of the road. He's a coward, he or she, whoever it was."