Did Maedhros kill Laughter?

[Nerwen]

Originally Posted by Eomer of the Rohirrim

It's a bit contradictory to ascribe blame to Morgoth now rather than Maedhros.

Not just that. The only reason for doing this at all can only be to annoy Morgoth. I mean, some people, after going to the trouble of infiltrating Angband, might take the opportunity to do something little more productive, but no, Lalaith's merely going to play a lame, childish prank. (Why a lizard, of all things?)

Very well. She means to annoy him. Now as, we know, Morgoth doesn't respond well to being even slightly annoyed.

Remember what he did when Feanor slammed the door in his face? Or when Lalaith's own father told him a few home truths? Or when Maedhros–

...Maedhros...

–Wait a moment... that sounds familiar...

Tell me, Urwen, if Morgoth retaliates for the lizard incident by murdering yet more innocent people, will that mean Lalaith is the real killer?