There is one other similarity, Grace said.
"I truly believe that their most important deadly common flaw is that they cannot empathize with others, they can't feel for someone who is suffering, and the murders don't mean anything to them," she said.
Grace predicted that unlike Anthony's trial, Arias will be convicted of murdering Alexander the same way Peterson was convicted of murdering Laci Peterson. In that case, Peterson was sentenced to the death penalty, a fate that Arias could face if convicted.
"It's very hard to get a woman sent to death row," Grace said. "Tot Mom' was acquitted, but I don't think Jodi Arias will be acquitted. The question is will they [jury] have the back bone to send her to death row."