Zombie was a prisoner in the Santa Priscan jail where Bane grew up. He was convicted of a drug related offense, he designed narcotics for South American drug lords. He worked in the infirmary where Bane lived until the warden decided Bane should join the main population. It was not until Bane was taken back to the medical wing to be subjected to drugs in the Venom Project that Zombie had a chance to work with him to escape Pena Duro. When Bane escaped to Gotham, Zombie helped synthesise Venom and with Trogg's help, built the Venom feed Bane used. Zombie was arrested when he attempted to extort control of the unions from the Dons for Bane. Jean-Paul Valley broke him out of prison to allow him to find, and take down, Bane. Since his rearrest he hasn't been seen.
Zombie prefers to use throwing knives as he isn't a good physical combatant.
Zombie is highly skilled in the use of throwing knives, he also has a great deal of chemical knowledge which he used to provide Bane with Venom.
Zombie is weak and emanciated but a foe must get inside the reach of his knives in order to use his physical weakness against him.