The detective heading the inquiry into the murder of Mrs Crown says “a number of strands of investigation” are being followed up.
Det Insp Fraser Wylie says the public holds the key to solving this “horrific offence”.
He said: “It has been a difficult investigation. The inquiry team will continue to do everything possible to find the person or people responsible. Every lead or piece of information will be followed through.
“Someone out there knows what happened to Mrs Crown on the day she was brutally attacked and I urge them to do the right thing and come forward.
“This is still very much a live investigation with a number of strands of investigation being followed by a dedicated team of officers from the major crime unit.
“The focus of the inquiry is to look towards identifying possible suspects with motive and eliminate those that can be eliminated.
“The belief is someone, who is close to the perpetrator of this horrific offence, will know something.
“We are still seeking witnesses and reviewing all forensic opportunities.” And he is adamant that the investigation team “still has a lot of lines to follow”.
Det Insp Wyle said: “The team is looking at all possible suspects, this is painstaking work and requires lengthy investigation.
“Officers continue to speak to local people in a bid to identify a lead that will eventually see the offender or offenders being arrested and charged.
“The public have always been key to this investigation. Someone will know the person or persons who have committed this vicious crime.”