A mother who says she was suffering postpartum psychosis when she killed her three children and attempted to take her own life is now on trial for their murder.

Lindsay Clancy's legal team does not deny that the Massachusetts mother killed her children, but is arguing she shouldn't be held criminally responsible because she was mentally…

Lindsay Clancy, 36, is on trial for killing her three children, Cora, five, Dawson, three, and eight-month-old Callan, at her Massachusetts home.