What is an "extreme" case of Murder?

BBC reports that the honor killings code in Pakistan has been reformed so that the defendent actually goes to jail, but only in "extreme" cases. As it stands now, usually it is the tribal custom that a payment to the victim's family is given in lieu of punishment.

Ok, I know this is supposed to be an improvement. But remind me -- what is an extreme case of murder? Are there any non-extreme murders?