Borce Ristevski has been sentenced for the manslaughter of his wife Karen and will spend up to nine years in jail.

The Victorian Director of Public Prosecutions has launched an appeal after Borce Ristevski was handed a minimum six years in jail for killing his wife Karen.

There was outrage across the nation last month when Justice Christopher Beale handed down the sentence of a maximum nine years’ jail.

However, with time served, the 55-year-old could be out of jail on parole within five years.

“The director has appealed to the Court of Appeal on the basis that the sentence and non-parole period are manifestly inadequate,” the Victorian Office of Public Prosecutions said in a statement.

RELATED: Ristevski’s cruelty wasn’t contained to killing his wife

RELATED: Sentence proves our legal system is letting us down

Ristevski pleaded guilty to the manslaughter of his wife Karen after a murder charge against him was downgraded.

He has never explained how or why he killed Karen on June 29, 2016, at their Avondale Heights home in Melbourne’s northwest.

After an extensive search for the 47-year-old, her badly decomposed remains were found in February 2017 at Mount Macedon Regional Park between two logs.

When handing down Ristevski’s sentence last month, Judge Beale suggested Ristevski escaped a more lengthy jail term because facts were unknown.

He said he “simply could not say whether” the killing of Karen was “middle or upper range of seriousness for manslaughter” because of this secrecy and “insufficient information”.

Justice Beale said “without knowing the level and duration of the violence perpetrated by you before causing your wife’s death” he struggled to rank the seriousness of the manslaughter.

“The view that I have arrived at is that I have insufficient evidence to say whether it is mid or high range, although it is not the lower end,” he said.

Regardless, Justice Beale said, “this is a serious case of domestic violence” and said the crime was definitely not in the “lower level” of offending.

“Karen was killed by you, by an unlawful and dangerous act in your home, in a place that should’ve been a sanctuary for her,” he said.