One of my supporting characters began to steal the show lately. He's a weak-willed young man, spying for the villain who blackmails him. He'll make some major plot points: first betraying the protagonist and his love interest to the baddie, resulting in a murder attempt against the hero, and later (being the only witness), he tells the hero's love interest it was the baddie who tried to kill the hero. Love interest kills baddie. And here I need to eliminate my little spy, because good guy will be tried for murder and he'll be in a great trouble if the only witness who could save him dies. (Yes, I'm evil.) What to do with my spy? Deus ex machina and accidents are right out, I just don't like coincidences. To know him better, he's not a baddie himself, just a poor victim who loved the villain and angsted a lot. (That's why the bastard could blackmail him.) The type girls would want to hug and comfort. Situation: they are on a man-of-war.