From Wikipedia:
On June 25, 2010, Cheney was admitted to George Washington University Hospital after reporting discomfort.[130] In early July 2010, Cheney was outfitted with a left-ventricular assist device (LVAD) at Inova Fairfax Heart and Vascular Institute to compensate for increasing congestive heart failure.[131] The device pumps blood continuously through his body so he now has no pulse.
No pulse=Zombie
What do you think? :D