WHITE PLAINS, N.Y. -- A New York judge has ordered a mental exam for a man accused of fatally stabbing three women in 20 years.

Lucius Crawford, of Mount Vernon, N.Y., pleaded not guilty Monday at his Westchester County arraignment on two of the killings. A third murder case is being prosecuted in the Bronx.

Crawford's lawyer requested the mental evaluation. He says he believes the 60-year-old defendant may be mentally disabled.

Relatives of the victims who were in court said afterward that the claim was nonsense.

Crawford has spent 30 years in prison for non-fatal stabbings in New York and South Carolina going back to the 1970s.