A woman has been charged over the murder of a Sydney teenager, bringing to three the number of arrests over the stabbing death nearly a year ago.
Hayden Burnes suffered severe stab wounds at a car repair business in Minchinbury, in Sydney's west, December 2011.
He was days shy of his 16th birthday and had just started an apprenticeship at his father's mechanical workshop.
His father, who is said to have links to the Lone Wolf outlaw bikie gang, had left to buy a coffee when the attack happened.
The 15-year-old was rushed to hospital but died from his injuries.
A 38-year-old woman was arrested in a motel room in Toukley, on the New South Wales Central Coast, in the early hours of Thursday.
She has been charged with accessory after the fact to murder and was refused bail to appear at Wyong Local Court on Friday.
Much of the police's homicide investigation has centred on the Central Coast.
After viewing hours of CCTV footage earlier this year, Strike Force Lemongrove detectives identified a ?? car they believed carried two men from the area shortly after the stabbing.
In April, the silver sedan was seized from ?Tumbi Umbi, near Wyong.
It was a breakthrough for investigators and led to two arrests in August and September.
Darren James McArthur, 36, was charged with Hayden's murder and appeared at Parramatta Local Court in August.
A second man, 42, formerly of The Entrance on the Central Coast, was arrested in Sydney's south a month later and charged with acting as the getaway driver.
It is not clear what police will allege the woman's relationship with the two accused men is.
Police have not ruled out further arrests. "Investigations are continuing," a spokeswoman said.
Police have previously dismissed media reports that the teenager's father was a member of the Lone Wolf gang, along with other reports that the attacker was a member of that gang. In August, 20 men wearing Lone Wolf club colours attended Mr McArthur's first court appearance and were involved in a confrontation with police outside the court.
Hayden's father also stormed out of the Parramatta court room when McArthur chose to remain in his cell while the murder charge against him was mentioned in court.
During unrelated raids on Lone Wolf premises in northern NSW this year, detectives said the gang is responsible for a large-scale drug distribution network, dealing in methamphetamine, cannabis and cocaine.
Police have also ruled out a theory that Hayden was killed by bikies over allegations he had raped a girl.
Friends had apparently alleged that a girl had fallen pregnant and, out of fear, claimed she had been raped by the 15 year old.