He  told police a series of evolving stories , then clammed up when pressed.
The couple’s adult  daughter, Sarah, was also interviewed by investigators around the same time as her father.

Borce Ristevski [(right], is reportedly unable to account for almost 100 minutes on the day his wife Karen [center], went missing

Karen Ristevski [left],with her husband Borce and daughter Sarah. All three family members were home on the day she vanished.

During an interview last July, Mr Ristevski told police his wife walked out of their Avondale Heights home on June 29 after an argument. Sarah, their only child, was the last person to see Mrs Ristevski before that row.
22-year-old Sarah, was present at the family home earlier in the morning before leaving, police have been told.
The interview, which took place not long after Karen Ristevski was reported missing, came to an abrupt end when her husband refused to ­answer any more questions.
He told police that after the row, he took his wife’s car for a drive on the Calder Highway to fix a faulty fuel gauge. He hit a bump and the fault corrected itself, so he drove home.  But when pressed by ­detectives, Mr Ristevski could not ­account for his actions for a period of just under an hour and 40 minutes.
Mrs Ristevski’s body was later found in the woods at Mt Macedon on February 20 this year.
Prior to the discovery, police strongly suspected her body was in that area.

Karen Ristevski ‘s badly decomposed remains was found eight months later, in a shallow grave, between logs at Macedon Regional Park, near Melbourne on February 20, 2017 

Borce Ristevski refused to answer any more questions when pressed for the missing minutes, bringing an interview with police to an abrupt end.

Shortly after Mrs Ristevski vanished, police obtained evidence from her mobile phone and that of her husband which showed that on the day she disappeared the phones had “pinged” off transmission towers on the Calder Freeway.
Mr Ristevski’s phone was last tracked near Diggers Rest and Mrs Ristevski’s phone was tracked near Gisborne.
His phone was also switched off for two hours on the day.
CCTV footage which police released in June showed a car investigators believe could have been Mrs Ristevski’s distinctive black Mercedes coupe being driven through Diggers Rest on the day she vanished.

Borce Ristevski and his daughter Sarah

CCTV shows Karen Ristevski’s car being driven through Digger’s Rest, on the day the woman went missing.  Police said Borce Ristevski’s phone had been turned off for two hours, that day.

Mr Ristevski’s phone was found to have pinged a transmission tower in the area on the day while Mrs Ristevski’s phone said she was near Gisbourne – a further 20 kilometres along the Calder Freeway. police also shows Mr Ristevski’s phone had been turned off for two hours.

Mr Ristevski, 53, has denied any involvement in his wife’s death. Both police and his legal team have confirmed he is being treated as a suspect in the case.
Earlier this week, one of Ristevski’ s pals recalled ‘chilling’ comments he made when the pair met up in South East Asia.
The man, who wanted to remain anonymous, told Seven News that while the pair had been drinking together on the trip, the suspect told him: ‘This looks like a good place to get rid of somebody.’
Police sources revealed that an iPad seized from the Ristevski home included a Google search on how forensics officers can detect traces of blood.
The couple reportedly had money problems prior to her disappearance.