There is no direct evidence linking Casey Anthony to the murder of Caylee Marie Anthony. Most evidence pointed out were circumstantial, that defense did what it could although i think the prosecution had no solid evidence to tie Casey with murder she was charged with especially the duct tape being the murder weapon as suggested by them. 

In this case Ajay has admitted to having sex with the girl, 400 years I think is too much as well, but it is what it is, you don't go Fking around with your daughter, period. The system has made an example out of this guy and that is what the American justice system does.