Zombies are the living dead, so I assume they can. But it makes no sense that they can die twice. And if zombies can die, can't they just come back to life again? That would mean that Sonny would have unlimited health and would never be able to die, and therefore the game would be completely pointless and Krin would not be a well-known name.
A seemingly normal telephone from the early 21th century that has been modified to fire weak sound pulses at the target when a specific number has been pressed.