Originally Posted by SS_Summer:
“I hope it is Emma. If they have to kill him off and leave their family broken, I want it to be huge, not just an accident. Emma catches him with Moira or admits he's in love with Moira, Emma goes nuts, and I could see Ross as either accomplice or someone who helps her cover it up as she plays grieving widow.”
Well this is my theory....
Debbie will return and blow Ross' secret that he shot Robert, James will then disown him and kick him out of the flat. That would give Ross a motive, however at the same time, Ross will let slip about James and Moira leading to Emma going insane and killing him. Then she will frame Ross, either by accident or an attempt to get Ross out of the picture so she can get closer to Moses.