No. No one deserves to die, not even a killer.

I would say that anybody who would kill another person (outside of self defense) would have to have some sort of mental problem.

Even if they were trying to kill you? 

Depends who they killed. If it was a member of my family, I don't think it would be an issue for me apart from the threat of gaol time.

Innocent lives will be saved...

It's not like those imported lethal injections are cheap, hell they don't even work half the time. Now that's a real waste of money

If you would kill a killer would you then kill yourself? If not you're what we call a double standard killer.

Like many said, it really depends on the conditions
If the killer had a mental issue or killed someone by accident i.e car accident, then no
But if the killer just kills people for money and other reasons, they deserve to die

But I don't I could take another persons life

I said I would never kill another human being... That is because I don't have a gun! If I had one I would kill everyone.

Just kidding, I guess I would do it if it was self defense but... you never know how you are going to react in such a desperate situation. I wouldn't enjoy it though.

To add, death penalty cases actually can cost a lot more because they have to take extra percautions and checks with the legal system, and the extra years of lawyers, legal aid, jury selection, etc for a death penalty case being appealed/worked on multiple times can end up costing even more.

My thought process against the death penalty even as a conservative/libertarian is that I don't want the government having the power to decide life and death over the people. Even if a jury of your peers decides it, lawyers and judges still play a big part in the system itself and sway things in this unidealistic world.

If he is about kill me, I wouldn't doubt any second to kill him, no matter what.