Don't even know if this was an unsolved episode. So some women i think killed her kids, now she did various TV interviews(obviously lying through her teeth), eventually she was convicted. I remember she looked a bit like princess Diana, small face, white, blonde hair, and she had that big grin when asked about the killing. Probably about 20 years ago now. Who am i talking about?

Don't even know if this was an unsolved episode. So some women i think killed her kids, now she did various TV interviews(obviously lying through her teeth), eventually she was convicted. I remember she looked a bit like princess Diana, small face, white, blonde hair, and she had that big grin when asked about the killing. Probably about 20 years ago now. Who am i talking about?

It wasn't featured on UM but I'm sure you're talking about Diane Downs.

http://en.wikipedia.org/wiki/Diane_Downs

That's it thanks.

there was also another case featured on UM final appeal: Darlie Routier. I remember that one well because it happened near my hometown and it was all over the news well before it was featured on UM.