Murdered Victorian mum pleaded for help six days before death

A 33-year-old, "very scared" woman made urgent pleas for help in the days before she was brutalised, shot, dumped in a mineshaft and burnt, a Melbourne court has heard.

Simone Quinlan made the statement to police about her violent boyfriend Brendan Neil six days before she was allegedly killed by his mate Wayne Marmo in August, 2015.

Marmo, 25, is on trial for murdering Ms Quinlan but denies murder, claiming she was already dead when he shot her five times in the head with a .22 rifle after an alleged prolonged attack by Neil at his Melton home.

The prosecution earlier argued that it did not matter whether she was dead at the time of the shooting as Marmo was "complicit" in Neil's alleged actions.

The Supreme Court of Victoria on Tuesday heard a statement Ms Quinlan made on August 19, 2015, six days before Neil allegedly hit, kicked and struck her to the head with a hammer, and Marmo transported her body to a mineshaft at Kangaroo Flat.

In Ms Quinlan's statement to police, she says Neil had become increasingly violent during their relationship and had even hit her in the head with a baseball bat.

Ms Quinlan said she had stayed at her sister's house on one occasion to escape Neil, but that he'd driven to the house, smashed the windows and messaged her saying "come out or see what happens".

"I am very scared of Brendan, and want him to leave me alone," the statement read.

The court also heard of a series of abusive interactions between Neil and Ms Quinlan in the weeks and days leading up to her death, during which time she was attempting to reunite with a former lover recently released from jail.

She sent "urgent" Facebook messages to friends in the days leading up to her death, saying she needed help and had been living in a disused kindergarten.

During Tuesday's hearing, the court was also shown police GoPro footage of Ms Quinlan's body, including a thigh bone, at the bottom of a mineshaft at Kangaroo Flat near Bendigo.

Senior Constable James Fitzgerald told the court he entered the mineshaft to collect her remains, but as he transferred them to a body bag, they broke apart into three sections.

The court was played police interviews with Marmo on September 25 and 26, just before he was charged with Ms Quinlan's murder.

During the interviews, Marmo told police he had no involvement in Ms Quinlan's death.

The trial continues.