So, lets think out of the box, and try more executions
1. Zerglings are released from an airlock and eats the criminal.
2. Zealot comes and slices the criminal
3. Criminal gets zapped by Mothership
3. Criminal gets sucked up by random blackhole and is never seen again
4. Criminal gets nuked.
5. Criminal gets eaten by ZOMBIES!!1 (Infested Colonists)
I was seriously high when making this :o