Depends on the circumstance. If it was self defence, then probably. If it was cold blooded murder then no, I'd call the police. Blind love like that leads to messed up cases like the moors murderers. I couldn't live with myself knowing I'm just letting someone cause harm to society
Harm to society????laughing out loud.
One person dying will not harm society apart from the emotional 'greef' that the family will experience that will be temporary.