The perfect crime

Here, apparently, is how you do it:

1. Decapitate one person, repeatedly stab another
2. Approach the American border
3. Give up your bloodied chainsaw, homemade sword, and brass knuckles
4. Be released

Well, it wasn't a perfect crime. Some smart detective put 2 and 2 together when corpses were found in the home of the man in question. The murderer is now in custody.