The father of a 19-year-old Melbourne woman stabbed to death at a party in a short-stay city apartment says his life is finished, as her teenage killer is committed to stand trial for murder.

Key points: A 17-year-old boy has been committed to stand trial for Ms Chol's murder

A 17-year-old boy has been committed to stand trial for Ms Chol's murder Ms Chol, 19, was a legal studies student and talented soccer player

Ms Chol, 19, was a legal studies student and talented soccer player Her accused murderer has offered to plead guilty to manslaughter but prosecutors have rejected this

Laa Chol was stabbed in the chest as she was being held while trying to defend herself during an altercation at the EQ Tower on A'Beckett Street in Melbourne's CBD in July last year.

The knife plunged 8.5 centimetres into Ms Chol's chest, piercing her heart, the Children's Court was told as her mother sat weeping in the public gallery supported by family.

The 17-year-old, charged with her murder, had been asked to leave the party shortly before the stabbing, the court heard.

Ms Chol was among a group of young people staying at EQ Tower. ( Supplied: Booking.com )

The court heard the altercation was captured on CCTV, which showed the teenager step back from the fight before producing a knife and stabbing Ms Chol once in the chest.

The other people present did not realise she had been seriously injured immediately after the stabbing as she continued to try to vigorously defend herself, the court was told.

The court heard her killer later disposed of his bloodied jeans and denied he had been at the party or was responsible for the stabbing when initially asked by his brother's partner.

The teenager, who cannot be identified, has since admitted to stabbing her and offered to plead guilty to manslaughter.

But that offer has been rejected by prosecutors and he will instead stand trial for Ms Chol's murder.

He has formally pleaded not guilty.

'She was the firstborn for me'

Outside court, Ms Chol's father, Daniel Kunyrith, shared his grief over the death of his eldest daughter who was a second-year legal studies student and talented soccer player.

Sorry, this video has expired Laa Chol's father speaks about the loss of his daughter

"My life [is] finished, it's gone," he said.

"She was the firstborn for me.

"I don't have anyone now in university."

Mr Kunyrith said his daughter had contributed positively to the Australian community, but that had all been taken away.

"How do I survive? How do my family survive?," he asked.

"How do my community survive?"

Ms Chol was in the second year of her legal studies course. ( Instagram )

Earlier, the teenager's defence lawyer told the hearing that it was a difficult case not to have an emotional reaction to, but that there was not enough evidence to support a murder charge.

He argued there was not enough evidence that the boy had intended to cause really serious injury.

But the prosecution rejected that argument and told the hearing the teenager had aimed for her chest.

"This is not a situation where there's a dynamic scuffle … he takes a step back, he can be seen to be looking in the direction of the victim, and then takes a step forward and plunges the knife into her body," she said.

"He appears to drive the knife towards her body, towards her torso."

The magistrate ultimately ruled there was sufficient evidence to support a murder conviction and committed the teenager to stand trial.

He will face the Victorian Supreme Court next week.