As in all cases like this...

The punishment should fit the crime. Murder should automatically equal the death penalty. Its just a shame that serial murders can only die once, even though they deserve to die many times over.

[nerdy mode] It reminds me of that episode of Star Trek Voyager when the penalty for murder was you had to relive your victims last moments before you killed them. You had to relive this every hour for the rest of your life. This way, you can never forget the pain you inflicted and the horrible experience it was. [end nerdy mode]