[Name] FoxDie [Source] Metal Gear Solid [Symptoms] 
FoxDie is a virus responsible for killing people with certain genetic markers via cardiac arrest. FoxDie is given to protagonist Solid Snake by Dr. Naomi Hunter, only it is engineered to go off at an indeterminate time. FoxDie was also the cause of death of Liquid Snake, Decoy Octopus (impersonating DARPA chief Donald Anderson), and the ArmsTech President.