This is where I wish they had a Law & Order thing to see what would happen with those two,as well as last week's episode. I could see plea agreements for them. The fact Mark didn't kill Elizabeth even though she could ID him will go a long way for him and Meg.
They will do some time for asaault but IMO,Ron was a dead man anyway. Elizabeth simply took advantage of an opportunity to kill her husband and shift the blame on to the perfect scapegoats,two home invaders.
And if she has a good lawyer she could possibly even get a reduced sentence given that she believed her husband had been plotting to kill *her*, couple that with the stress of her ordeal, it could be argued that she just 'snapped' when she saw her husband at her mercy.
I'm intrigued by who Mac's friend request is from. He didn't seem all that happy by it, so it can't be somebody he already knows/likes. Maybe another NCIS fan
Alas, her speech at the end to Mac and the fact she was willing to let her daughter take the fall for a murder she committed will hurt her in a big way.