Lawyers for Canadian serial killer Robert Pickton have filed an appeal against his conviction on six counts of second-degree murder.
Robert Pickton has been in custody since February 2002
He was given life last month for killing six Vancouver prostitutes whose bodies he fed to pigs on his farm.
Pickton's lawyers argue that the judge made errors during the 10-month trial.
Prosecutors are also appealing against the convictions and want Pickton to face a new trial on 26 counts of first degree murder, a more serious charge.
The prosecution argue that the judge, James Williams, erred in law by ruling that one large trial would be too much of a burden on the jury and allowing the trial to proceed on six counts only.
They also contend that he erred in his instructions to jurors.
Prostitutes and drug addicts
Pickton, who has been in jail since his arrest in February 2002, still faces trial over the deaths of the 20 other women.
He has pleaded not guilty.
His defence team filed their appeal on Wednesday. They are also challenging the way the judge instructed the jury and allege that he allowed inadmissible evidence.
In December, Jurors acquitted Pickton of first-degree murder on the first six charges, but found him guilty of second-degree murder - a lesser charge that means a murder was not premeditated.
Most of Pickton's victims were prostitutes and drug addicts from Vancouver's Downtown Eastside.
Police are investigating the cases of another 40 women missing from the region.