A psychologist says Lindsay Clancy reported hearing a male voice ordering her to kill her children. 

Paul Zeizel testified on Tuesday about evaluating Clancy after the killings.  Zeizel says Clancy described the voice during a phone call with her then-husband. 

The defense argues Clancy was suffering from postpartum psychosis and was not criminally responsible.  Prosecutors contend she planned the killings and intended to die by suicide.