HALIFAX - The parents of a mentally ill Nova Scotia man facing two murder charges say he will plead not guilty because he wasn't criminally responsible for his actions while in a psychotic state.

As well, Mark and Donna Race say they want their son, Glen, to stay in Canada after his trial, even though U.S. authorities expect him to return to an American prison to complete his sentence for a fatal shooting in Upstate New York.

The family's lawyer, Joel Pink, told a news conference that he is considering a constitutional challenge aimed at keeping Glen Race in Canada.

The 29-year-old man, diagnosed with schizophrenia in 2001, is to return to a Halifax-area court April 21, having undergone two psychiatric assessments since he was extradited from the U.S. in October.

Convicted in 2008 of fatally shooting Darcy Manor in Mooers, N.Y., Glen Race now faces murder charges in the deaths of two Nova Scotians, Michael Knott and Trevor Brewster.

Knott's body was found on a path in southwestern Nova Scotia on May 5, 2007, and Brewster's body was found four days later under a boardwalk at a Halifax lake.