Police are offering a $500,000 reward for information about the murder of a Melbourne woman 30 years ago.
Nanette Ellis, 41, was stabbed to death in her Manuka Drive home in Boronia 30 years ago today.
She went to work as normal and had planned to go out to dinner with colleagues on February 10, 1984.
She was seen entering her house after work and her body was discovered a short time later by her son Greg Ellis.
"It's not something I try to think about, but I carry it with me all the time," he said.
"I think to get some closure around those events we need to find who's responsible and to seek justice on behalf of our mum."
Detectives started re-examining evidence in 2010 but have been unable to find any suspects or motives.
Police say Ms Ellis was a friendly 41-year-old single mother who worked as an advertising manager for a local newspaper.
She was well liked and had no known criminal associations.
"Homicide squad investigators have processed more than 800 pieces of information (but) we still don't have any suspects or a motive for Ms Ellis's murder," Senior Sergeant Stuart Bailey said.
"But there is someone out there who knows what happened to Ms Ellis on that evening."
Senior Sergeant Bailey said her car had been vandalised in her driveway on a number of occasions before her death.
Paint had been tipped over the car, the tyres were slashed and the number plates were removed.
The Department of Public Prosecutions will consider granting indemnity to anyone who provides information about the identity of the offenders.