In regards to those other cases, you have to remember the jury wasn't always privy to everything that "we" were. A lot of the information we heard didn't get in or the prosecution didn't use it.
That's why it is so important for the prosecution to put these cases together correctly. You hear so much talk about the "hard evidence". The DNA, fingerprints, video, eye-witness testimony, etc. But I am one who really believes that many times a circumstantial case can be much stronger than a case with hard evidence.
A great prosecutor can put all of those factors together and it really paints a picture about what was really going on, and what happened. It's almost like the process of elimination. This case is perfect for that.
I don't know if there is any hard evidence. And in this case, it really wouldn't matter. The victim & the accused lived together in the same house. So their DNA would be intermingled all over the place. She was shot with her own gun. His fingerprints on the gun really wouldn't mean much. The gun belonged to "them" as a couple. So one could assume they both handled it. He wasn't covered with blood. And even if he showered and they found evidence of her blood in the drains, it could be argued she had cut herself shaving her legs a couple days before, etc, etc.
But the circumstantial evidence is PILING UP. And it is telling a very, very ugly story about SL, who he is, how he behaves, and how he treated Melinda. And next week it's only going to get more ugly.
Any of these things by themselves wouldn't mean much. A $1.1M life insurance policy on a 22 yo house wife that was about the expire. A husband behind on child support to ex-wife and about to face contempt charges. Suspicious "stalking" reports made by the couple right before the murder. A controlling husband. A wife afraid of her husband. A husband with no job. A "home invasion" with the flimsy husband's story, him left unharmed, and his wife shot dead in the head.
There's more, but you get the gist. You start piling all of those things together and you just can't excuse it all to coincidence. It's too much.