How would the bullet not explode when shot? You need (X) amount of force to propel an object of (X) size, into a person (X) feet away. That's normally done with gunpowder, which would melt/explode the bullet. Right?
Myth busters were able to make a working ice bullet. It has more to do with finding the right caliber and load. Its very possible.
Hmmmm put them into a sleeper hold once incapacitated ,wear gloves ,and use their hand the shoot them self in the head. Be sure to wear something that covers all your skin because they scratch you, your skin is in their finger nails.
Thats more of staging an accident rather than using a weapon.. But it could work I think its even been done before.
As far as the ice bullet goes, how would it be shot? Heat from anything that shoots projectiles capable of piercing skin will melt the ice before it reaches the target.
I understand that a CO2 gun may be able to work if given enough pressure. And as said before, it would also depend on the "caliber of the ice bullet".
My suggestion on page 2 kicks all of UR suggestions ass.. Let me put it this way.. NO trace.. Not in the body.. Not at the scene (it dissipates).. Not biological traces (like finger prints or Ballistics).. Huh
The issue there, is that you need to have your victim in an enclosed area for the carbon dioxide to kill them. Since there would be a specific location, there are plenty of things that could go wrong in the murder and get you caught.
This. Tom Clancy wrote a book wherein this technique was used.... As in the oxygen needle, the only trace is the puncture hole used to inject it. I read somewhere as well, that if you inject into the buttocks, coroners dont notice as much due to autopsies being performed with the victim facing up. Not too sure bout that myself, but yeah... Potassium is the way to go. EDIT: Had an evil thought. Make a minor incision on the person, something small and in a place where it can be explained away as trivial. Use THAT as the site to inject the potassium. A needle hole in a cat scratch would not be noticed. Or overdose them on heroin and leave the needle in their hand.... oops, another junkie just killed them self. Look no further. Case closed.
At the end of the day, doesn't matter how you kill em, just remove teeth and hair, feed to starving pigs, burn hair, throw teeth in the ocean. kill and eat pigs....just to make sure they don't squeal...
The icicle is bad for more than the reasons described in the OP. The melted icicle water will contain skin cells from the assailant(s) so DNA would be left all over the victim's wound. One weapon I've heard of with a piece of frozen meat for example a large ham. It's hard enough to smash the brain of the victim plus then it is easily cooked and all evidence would be gone. Make sure to feed the bone to your conveniently owned dog