It's not the woman who was at the house with Michelle Young watching "GREY's ANATOMY."
It's a 15-year-old kid that lives in the house right next door to the Young home. He's got (at a minimum) serious emotional / behavior problems.
His own parents are afraid of him, and the people who sold their house to the Youngs moved (in part) because of this kid. They even said they were just waiting for the day they'd come home to see police cars and crime-scene tape at their neighbor's home.
A while back, this kid pulle out all of his eye-brows and eye-lashes. Now, I understand that this doesn't make someone a murderer, but it doesn't make them a saint either.
At this point, a lot of things seem to point to the husband, but I'm still not convinced that it's at least a 50/50 chance that this kid did it.