A WOMAN who was allegedly run down and killed by her boyfriend was infatuated with him although they argued constantly, an ACT court heard today.

Amaranta Vrinalin Vega, 18, died early on New Year's Day after being hit by a car in the Canberra suburb of Gungahlin.

Her boyfriend of two-and-a-half years, Wayne Rino Antoniazzo of Narellan Vale in NSW, was allegedly driving the car and has been charged with manslaughter.

The 22-year-old faced the ACT Magistrates court today on three other charges as well - driving while disqualified, possessing a prohibited substance and not stopping after an accident causing death.

Mr Antoniazzo's father, mother, uncle and a friend were in court to support him while there was a large contingent of the Vega family sitting on the opposite side of the courtroom.

Detective Senior Constable Katherine Laidler told the court Mr Antoniazzo had been living with Ms Vega and her mother Gina Silva in Narellan Vale for two-and-a-half years.

Ms Silva had told Sen Con Laidler that the relationship was "unhealthy'' as Ms Vega was infatuated with Mr Antoniazzo but they constantly argued.

The couple were visiting family in Gungahlin when the incident occurred.

Witnesses said yesterday Ms Vega and Mr Antoniazzo were arguing loudly in Mary Gillespie Ave just moments before the incident occurred at 2am.

The argument and the sound of loud banging of fists on the car woke neighbours before Mr Antoniazzo allegedly got into his car and drove off. 

Ms Vega then allegedly laid on the road.

Witnesses said yesterday they were debating about whether to go and check whether she was alright when the car is alleged to have driven at speed around a corner and back towards where Ms Vega was on the ground.

"She saw the car coming, she lifted her head up but it was too fast for her to get out of the way," a witness told The Daily Telegraph yesterday. "It was too close for him to slow down."

Another witness said she began screaming to alert Ms Vega about the oncoming car but it was too late.

After the car allegedly hit Ms Vega with a loud bang, Mr Antoniazzo drove off.

A neighbour who saw the tragedy from her upstairs bedroom window called police before rushing to help the badly injured Ms Vega.

"She was going into and out of consciousness," the neighbour said.

"There was blood coming out of her head."

As Ms Vega's friends and relatives gathered around her on the road, the car is alleged to have returned to the scene.

It swerved off the road to avoid the group gathered around the injured Ms Vega and ran into the median strip, damaging a steel pole, before it drove off again.

A witness took down the number plate of the blue Holden Commodore.

A major search for Mr Antoniazzo was launched involving officers from the ACT dog squad, special response and security team and general duties officers.

Police located the vehicle they believe was involved about 3am after it was abandoned on Horse Park Drive near the Federal Highway. 

Mr Antoniazzo was located on Majura Lane not far from the Federal Highway just after 7am.

Ambulance officers worked on Ms Vega at the scene but she died later in Calvary Hospital.

The death has not been included in the territory's Christmas road toll.

Witnesses said the family hosting the New Year's Eve party had moved into the neighbourhood just weeks ago.

"It's a beautiful pleasant neighbourhood, the party was pleasant, the music was nice," one neighbour said.

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