consider the prosecution which says carmella della rosa was not insane but evil, commonwealth attorney ray morrow says she killed her granddaughter because she hated her son-in-law and resented the baby and felt betrayed by her 19-year-old daughter after she got pregnant so young and out of wedlock. but public defender don grudder said della rosa was a loving mother until mental illness took over her life causing numerous suicide events in the months leading up to this incident. she said she didn't get the treatment or the medicines she desperately needed to be healthy. a defense psychologist said della rosa was delusional the night of november 29th. he said her severe, depressive disorder caused psychosis and that she did not understand the nature of what she was doing. you know, we've often heard people say about this case that oh, she must have been insane for a grandmother to do something like that. but there is a very narrow legal definition. they must find that carmella della rosa did not know what she was doing the night she tossed her granddaughter off that sky bridge at tysons corner cen

clearly there was evidence put on by ray morrow, the fairfax county attorney, that she did, in fact, difference between right and wrong at that time. >> there was a statement she gave to the experts and basically saw this as a way to get back at her son-in-law, whom she was angry for getting her daughter pregnant out of wedlock. >> you know, that, i think, is what the jury -- weighed heavily on the jury coming to a decision. clearly, when you're dealing with the insanity defense, you're dealing with a battle of experts. mental health care providers for the defendant and against the defendant. a jury had her video testimony saying that she had actually calculated and planned to kill this young child. >> right. they came back with the conviction of first degree murder. had they found that she had a mental incapacity, if you will, would that have been different, a different verdict? >> certainly they could have found her not guilty by reason of insanity, or if you remember and the viewers remember in the 20th century the most horrific case we can think about was united states versus joh