chicks who "OD" don't need to be tied up, gagged...oh yeah and they don't need to be strangled either.....
That's the whole thing... the autopsy has already been done: she died of strangulation... she didn't OD. So someone is gonna do a lot of time for this; she didn't strangle herself.
Assuming this was the result of a spur-of-the-moment rage, which the cause of death would seem to support, the lack of premeditation would take the death penalty or even life w/o parole off the table.
So, if the "doer" is craig, I'm guessing he does around 20 years (of a 20-life sentance) given his past criminal history.
If Kelly rolls on him and convinces the prosecutors she wasn't involved until afterwards, she prolly won't serve much more than 5 years.
This all assumes that Craig did the deed. It Kelly did it, or if Kelly fails to turn on Craig, this obviously changes things a lot.