They know the why: A girl
Play it again, Sam.
I've heard four stories like these in recent years happen in my area, but only one of them was a homicide.
I always wondered how the girl feels when she finds out that she was the reason of sick jelaousy. In this specific case I can't say who's fault was the trigger to the murder, but mostly the girl can have her conscience clear.
Still - I knew many witches (because calling them girls or women would be a crime to the fair and noble gender) who'd sent their Johnnies on some poor chaps that looked at them in a bad way.
One guy in my highschool fell in love (as he stated) in that kind of girl. He was nice, and he was played by her. Ended up beaten by her boyfriend and his friends, a type of guys that in US would bear the name of "jocks"
, I suppose. And beaten up badly - two months in a hospital. Good thing that he didn't suffered any permament damage.
And the age of the criminals is also terryfying. It happens the same here, most stupid murders (for an i-pod, i-phone and other gadgets or money) goes around in a youg teens circles, 12-16 year old. Boys are able to beat up some poor chaps, while girls go to the malls and prostitute themselves with some older buisnessmen class kind of guys for those things.
Again - shit's fuk'd up.