The Killer

"Murderer!" said ten-year-old Ian.
"I... I didn't mean to... It just happened," said nine-year-old Luke.
Ian scrutinised the victim. "Why, Luke? Why?"
"I don't know... I... I just—"
"Just what?"
"I just didn't think."
"And now you've taken a life."
"It... It was an accident, okay?"
"Luke, I was watching you, it was no accident."
Luke lowered his head and looked at the floor.
"Let's go, before someone finds the body," said Ian, prising a rolled-up magazine out of Luke's hand.
A fly lay motionless on the window ledge - all six legs in the air.