Borce Ristevski's '100 lost minutes' on the day of his wife Karen's disappearance.

On April 18 2019, Borce Ristevski was sentenced to nine years in prison for the death of Karen Ristevski.

Borce Ristevski, the husband of murdered Melbourne woman Karen Ristevski, continues to be questioned by police about his movements on the day his wife went missing last year.

47-year-old Karen was reported missing on June 30, 2016, the day after husband Borce says he last saw her leaving their Avondale Heights home.

On the day of her disappearance, Borce told Victoria Police that following an argument with his wife, he took Karen's Mercedes-Benz SLK coupe out for a drive on the Calder Freeway, did a u-turn and then returned home.

The Herald Sun reports that Borce also told police he had driven her car to five its fuel gauge.

CCTV footage shows Borce near Diggers Rest on the day, approximately 20 kilometres away from their family home in of Avondale Heights.

But it's the 100 minutes from that day that Borce is unable to account for that police are desperate to know more about.

According to data pulled from Karen and Borce's phones by police, both phones were found to have registered on transmission towers near the Calder Freeway. Karen's phone then registered on a transmission tower near Gisborne.

Police also found that for two hours that day, Borce's phone was switched off.

Karen Ristevski's body was discovered by a jogger in the Macedon Regional Park on February 20.

In June, Missing Persons Squad Inspector Tim Day confirmed that Victoria Police considered Borce Ristevski to be a suspect in the murder, but would not confirm if he was considered to be the prime suspect.