"I'm not a rock thrower," he told me at the time.
In response, security forces detained some of the rock throwers.
An army spokesman confirmed the death and said the youth was shot when troops who pursued rock throwers found themselves in a dangerous situation.
Each four-member team includes a rock thrower and a captain.
Now, Mwili, like a lot of children his age, was a fair rock thrower.
I took one look at them and saw that they were just angry rock throwers.
The rock thrower had made no attempt to hide the fact that he had been there.
He prides himself on being "the best rock thrower in the county."
But many of those - like the rock thrower - had been thought of before.
He was told the windows had been broken because of rock throwers.