Sunday marked the two-year anniversary of the near-fatal bashing of Altona bookshop owner Jill Brookes.
No one has been charged over the attack, but detectives say the investigation remains active. They believe the assault was an isolated incident.
Police have been unable to identify a man captured on CCTV handing in an anonymous letter about the case to Altona North station. They hope a $100,000 reward will entice the man to come forward.
Police believe that on the afternoon of July 20, 2012, a man entered West Side Stories in Harrington Square and bashed Ms Brookes in a “frenzied” attack.
She was discovered by a fellow trader, lying in a pool of blood with her head caved in, about 5pm.
Her sister Susan, who asked that her last name not be published, said a second ceramic plate was put in Ms Brookes’ head after her body rejected the first.
Hobsons Bay’s Detective Sergeant Brad Lawrence said investigations were ongoing.
“I know that two years on is quite a stretch,’’ he said. ‘‘But we’re trying to ensure that we cover all avenues of inquiry.
“We’ll continue to do that until we’re completely satisfied.”
The man captured on CCTV is believed to have dropped off two other letters and is thought to be able to provide clues to Ms Brookes’ assailant.
The first letter, containing newspaper clippings, was left at Altona North police station on May 21 last year.
A second letter, addressed to Altona police, was left in the letterbox of an Altona home on July 2.
“We haven’t heard back from the person who initially contacted us,’’ Detective Sergeant Lawrence said.
‘‘We would certainly encourage that person to come forward.
Investigators are also seeking information about a truck seen in the area about the time of the assault.
The man captured on CCTV was described as being Caucasian in appearance, with a medium build. He was wearing khaki overalls and a dark, checked flannel shirt.
Anyone with information is asked to contact Crime Stoppers on 1800 333 000.
