Four men have each been sentenced to ten years in prison for disposing of and trying to destroy the body of Rebecca French in Co Wexford last year.
At the Central Criminal Court, Judge Barry White described the killing of the 30-year-old as 'brutal' and 'savage'.
He said the sentence was the maximum he could impose.
However, he suspended the last two years for three of the men, who are originally from Lithuania and Poland, if they agreed to leave the country and never come back.
He also suspended the last two years for the fourth defendant.
In October, two of the men pleaded guilty to impeding the investigation into the killing of Rebecca French at Árd Na Dara, Clonard, Wexford.
Ricardas Dilys, 28, and Ruslanas Mineikas, 26, of Goodtide Harbour and formerly of Davitt Road South - both in Wexford town - were on trial for her murder when they made the pleas.
They had pleaded not guilty to her murder but the murder charges were dropped when a legal technicality meant their admissions in garda custody could not be used against them.
Two other men, 41-year-old Patrick O'Connor of Árd Na Dara, Clonard, Wexford, and 27-year-old Piotr Pasiak of Lower John Street in Wexford, had already pleaded guilty to impeding the investigation in the same way.
Ms French's body was discovered by firefighters in the boot of her burning car at Cod's Lane on 9 October 2009.
In sentencing, Mr Justice White said in his view the maximum of ten years was inadequate for this type of offence.
He said the men showed no respect for the mother-of-two after she had been killed and that they had disposed of her body in a manner not befitting an animal.
He also said little or no remorse had been shown.
Mr Justice White sentenced the men after he was told that the Director of Public Prosecutions had his full confidence.
The judge had asked for the Director's opinion following the family's victim impact statement, which was highly critical of the justice system.
The DPP reviewed the statement and said it was understandable for the family who made such comments as they were distraught and grief stricken.
He also said he had absolute confidence the judge would apply the principles of sentencing.
