Lindsay Clancy's former psychiatrist is facing the defense today. Dr. Jennifer Tufts is expected to undergo cross-examination as Clancy's murder trial enters its third week.  In previous testimony,

Tufts said Clancy showed no signs of psychosis and denied suicidal or homicidal thoughts one day before she killed her children. 

Clancy has admitted to killing her three children, but is asserting an insanity defense, claiming she was suffering from postpartum psychosis during the killings. 

Prosecutors allege the killings were premeditated and say Clancy planned to die with her children.