Got news here: I watched that episode on two different nights this week and read an on-line transcript of it. Despite what it says on the credits, I could find neither “Richard” nor “Gloria” in any scene. I suspect they both ended up on the cutting room floor.
The business about fabricating the victim’s keys was, BTW, dumb and completely unnecessary. I watched a clip of the first act on YouTube and he puts them down in the foyer at 01:20. At 03:05, Lee Grant takes them to dump the body. At 05:15, she takes them when she abandons the car. And at 05:45, she arrives home and puts them down in the foyer again. So GRANT HAD THE DAMNED KEYS ALL THE TIME, and her stepdaughter could have found them if she had bothered to look for them!