OTTAWA - The Supreme Court has reserved judgment on whether serial killer Robert Pickton should get a new trial.

Pickton's lawyers argued today that his right to a fair trial was compromised by faulty instructions from the trial judge.

But prosecutor John Gordon countered that no errors were made by the judge and -- if there were -- they were so minor that they don't warrant a new trial.

Pickton was convicted in 2007 on six second-degree murder charges in the deaths of Vancouver prostitutes.

He is serving a life sentence with no possibility of parole for 25 years.

The high court is expected to issue its ruling on the appeal in the coming months.