Tonight's Law and Order SVU mirrored after Kasey/Kaylee case?

It certainly was. The mother, father, and daughter were all just like Cindy, George, and Casey. The father killed himself at the end. George Anthony only made an attempt. They exonerated the Casey/Ashley character by finding that the child had died of measles before the daughter panicked and buried her. The Anthony case won't go to trial later this year, so that was speculation.