Moffat reassured fans: “I’m not very good at killing people. I don’t like it! I don’t think the Doctor’s companions should die, I think that spoils the fairytale a bit. But that doesn’t mean that I won’t [kill off companions] of course!”
Seriously though, he's killed Rory more times than I can remember of the top of my head. He has also killed, River Song, The Doctor and Amy! So don't say you don't like to kill people.
I say this all in love, because even though Steven Moffat is a Troll he's an extremely good Troll