Canada's top court is upholding six murder convictions of a pig farmer accused of butchering women and feeding them to pigs.

Canada's Supreme Court said Friday that Robert Pickton's right to a fair trial was not violated the first time around, and denied his request for a new trial.

Pickton was convicted of murdering six prostitutes in 2007 and sentenced to life in prison with no parole for at least 25 years.