Victoria Police have announced a $200,000 reward for information that helps solve the murder of a couple near Sunbury, north-west of Melbourne.
Steve Gulyas and Tina Nhonthachith were shot in the head on their farm at Wildwood on October 19, 2003.
They did not have a criminal history.
Detective Inspector Bernie Edwards says police believe the killers knew the couple.
“We have a few leads and we just need that one or two pieces of vital information to break the case open and make some arrests,” he said.
“By offering a $200,000 reward it really indicates to the public and the people involved and their family and associates how serious we are in relation to solving this brutal crime.”
Detective Inspector Edwards says they believe two separate handguns were used in the killing.
“Whether that indicates it was two people or one, that’s really open to the investigation,” he said.
“We are fairly positive that family members or associates have got information in relation to the crime and we’re asking those particular people or members of the public to come forward.”
Police say criminal indemnities may also be offered to anyone who can help convict the killers.