Instead of murdering Debbie, why couldn't Reiss have just...

Reiss could have just been honest. He could have turned around to the care home, said that he couldn't afford their fees (not admit that he embezzled them) and taken Debbie back to the house. He actually didn't have to kill her. He could have claimed carer's allowance, but then just stuck her in a back bedroom and forgot about her.

I actually would have enjoyed that creepiness more than this whole murder nonsense.

If anything, I could see Sonia killing her, because she couldn't stand to have her partner's comatose wife in the next room.