This may sound dumb but how about a pc who would have her party stand at one end of the temple district and then go near the kid, conjur a monster and have it force attack and kill her.
I mean there are all sorts of ways to kill off npcs in a game without doing it with your own hands exactly. And I do like to indulge in different roleplaying styles. I like to be good sometimes and I like to be kind of bad sometimes. It is really great to have options. But like I said above I may be too chicken to hurt Gavin that way.