If you kill someone, I believe you should pay with your life, behind bars. I believe that they should not be able to kill again and that justice prevails.

Most murderers do get life in prison.

Life in prison is not an eye for an eye.

Prison could be worse than death. Its a death of persons mental health by social isolation or extreme stress. Its more like prolonged torture. As for changing, nobody rehabilitates them so they cant or probably wont just change without help.

Well as for rehabilitation its about psychological counseling and teaching them socializing,work etc. most of courts just throw them in a cell and let them think what bad things they did, come to a conclusion and make a change in themselves. but probably this hasnt worked as well, because most of them are mentally ill or dont have any psychological skills to manage their behavior. So they get out and continue the same way they know best.

yes it is they should get life in prison so they cannot murder anyone again and so they get what they deserve.

Absolutely! If you take a life, your life should be taken away as well.

if a life is taken the taker of that life should be taken unless in form of warfare