The B.C. Attorney General's office told CBC News on Sunday the Crown will file an appeal in the Robert William Pickton case.

Last month, Pickton was convicted of six counts of second-degree murder in the deaths of six women who disappeared from Vancouver's Downtown Eastside.

Linda Mueller, a spokeswoman from the attorney general's office, said the appeal papers will be filed Monday.

She declined to discuss the reason for the appeal, but said Attorney General Wally Oppal would provide more details Monday.

Pickton, a 58-year-old pig farmer from Port Coquitlam, B.C., was arrested in 2002 and had been charged with first-degree murder in the deaths of the six women.

He still faces murder charges in connection with the deaths of 20 other women, but no decision has been made on whether to hold a second trial, Oppal said last month.