Taking the question of ethical justice/police murder out of it and purely looking at it from a 'would I rather my attacker died during the attack' point of view (say, they tripped and fell off a cliff whilst fleeing type incident)...
Yes, I'd rather they died.
I'm not one who holds human life sacred and inviolate, and I think that I'd recover better from the trauma knowing that it was impossible for my attacker to ever come near me again. If I found any need to forgive them, I could do that just as easily with them dead.
This, assuming that I've been raped or brutally beaten (not just punched me and nicked my purse)... yeah, I'd rather they were dead. There are seven billion people in this world, a tiny fraction of whom I love and the majority of whom I'll never meet. Human life is just not that special, and the punishment of prison is society's, not mine.
I don't believe in an afterlife, so I think this life is all we have, and it's the most powerful thing you can take from someone - including doing something as life-altering as a brutal attack. (I'm actually suffering the effects of long-term illness, and I resent that enough as it is, let alone some arsehole attacking me!)
I'm not saying I don't understand the benefits of a functioning justice system, nor do I want this to be a society that executes mob justice. I just think that purely on the premise of 'would I feel better if my attacker were dead or in prison' , then yeah, dead suits me fine.