Search for missing mother-of-four becomes a murder investigation as police access her phone records and discover what may have happened in her final moments

A seven month search for a missing mother-of-four has become a homicide investigation after police received information indicating she was murdered.

Kobie Parfitt , 43, is believed to have been murdered on April 28 - the last day police believe she was last seen alive

Detectives have stepped up their investigation in the suspicious disappearance of Victorian woman Kobie Parfitt, with murder cops now being drafted in.

Ms Parfitt's mother Kathy Snowball made an impassioned plea for information from the public last Sunday about the whereabouts of her daughter, leading to a tip-off to police. 

Based on the information, detectives now believe the 43-year-old was last seen alive at a property on Hickman Street in Ballarat, 115km northwest of Melbourne, on April 28.

Police also believe that was the same day she was murdered. 

Neither her phone or bank accounts have been accessed since.

Ms Parfitt, who is also a grandmother-of three, had become estranged from her family.

She was living in central Ballarat and had previously worked in disability support and aged care.

Police received a tip-off following a public appeal for information, which led them to believe she was last seen alive at a property on Hickman Street in Ballarat, Victoria

Detective Inspector Andrew Stamper from the Missing Persons Squad said they are aware there are more people out there with information about what happened to Kobie and who was responsible for her death.

'We have received a significant amount of information since Sunday and as a result, our investigation has gained significant momentum,' he said.

'While we feel we are close to getting to the bottom of what happened to Kobie, we are once again urging anyone who knows anything to come forward to police.'

'This include anyone who may have been involved, as it’s only a matter of time before we find them,' he said.

Kobie is 168 cm tall with a slim to medium build with long brown hair.

Anyone with information regarding Kobie’s death can contact Crime Stoppers on 1800 333 000 or file a confidential crime report at www.crimestoppersvic.com.au

Ms Parfitt was a mother-of-four and a grandmother-of three but had become estranged from her family