Guess the episode from the murderer's quote: "I find you amusing up to a point lieutenant, but you've passed that". P.S. If anyone gets it straight away perhaps offer a clue to the others.
I'm almost sure it's a murderess instead of a male murderer, so I guess that's a clue.
Is it, Nora Chandler in 'Requiem for a Falling Star'?
Yep it's good old Nora.