It's awful that knife crime is so bad. The only small consolation is that most of it involves gangs who are willing participants. where it is a tragedy is when innocent people are hurt.
Half these people are just teenagers. They need help. In an environment like that, all sorts of people pick up knives to protect themselves of their family / girlfriend. I think every death is a tragedy. Every life lost is a life that could have turned around, might have been going somewhere, has destroyed the life of their parents, siblings or kids. I'm not meaning to jump on you for this, you said it as only a "small consolation". But I question what "willing participant" means to a young person growing up in such an environment really means.
Honour killing for sure, she shared the same name as her killer before she got married.
The real question is if the Husband was part of it?
The story sounds a little "iffy" to me, he found this guy in the shed, he ran instead of closing the door and trapping him inside and when he got inside the house, he didn't close the door on him and all the while, somehow his wife got shot by a crossbow? You think... he be standing front of his wife, protecting her, especially in a small house they have.
Confronted by surprise by someone armed with a lethal weapon, running seems quite understandable to me. Nor, if he was "in on it" would he have likely opened the shed, screamed for his wife to run as he ran back to the house. Unless it's your contention that the whole scenario was fabricated and I see no reason to think so.