Kubilay Kilincer is on trial in the NSW Supreme Court accused of the brutal murder of Mr Dastan whose body was found bashed underneath a vehicle at Esy Auto Dismantlers in Blacktown on the morning of Monday December 11, 1995.
A metal pipe was shoved six centimetres into his mouth and his severe head injuries were consistent with an attack using a bloodied sledgehammer that lay nearby.
The 60-year old has pleaded not guilty to the murder.
On Friday, Gulser Kilincer gave evidence in front of a jury, denying that she had lied to assist her husband in covering up the killing.
In bugged phone calls, Mrs Kilincer was heard telling her husband's parents about what to say to police regarding a $500 debt owed to her father-in-law's friend who she saw as an "uncle".
Kilincer is accused of murdering his boss after stealing money from the business to repay his debts, and was on the verge of being sacked, the jury previously heard.
"Did you form a plan to get your in-laws to get their story straight in order to cover up the killing of Hasan Dastan?" asked defence barrister Ertunc Ozen SC.
"No," Mrs Kilincer replied.
In the phone conversations, the mechanic's wife was heard telling her in-laws the specific date that Kilincer repaid the debt. She complained her husband had told police the debt had been repaid by the time of the murder when it had not.
"Everything you say is a lie, Kubilay, everything you say is a lie," she was heard saying.
Under cross-examination, she denied she had told her parents-in-law to lie to the police.
"I suggest that you were falsely instructing to assist your husband with respect to the investigation," said prosecutor Brett Hatfield.
"I disagree, not falsely," replied Mrs Kilincer.
She told the jury her husband was not a violent person and that he had never said anything to her revealing that he had killed his boss.
She also rejected claims that washed clothing and shoes seized from the Kilincer home on the day of the murder had just been put in the washing machine before police arrived, saying she had started a load that morning after her husband went to work but before he came home.
The trial will resume on Tuesday.
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