<Ul> <Li> Donald Corren as Dr. Walter Kurian (seasons 1--2) </Li> </Ul> <Li> Donald Corren as Dr. Walter Kurian (seasons 1--2) </Li> <Dl> <Dd> Dr. Walter Kurian, the main antagonist of season 1, is first encountered in episode 13, "Doctor of the Dead". Kurian is revealed to be responsible for the virus known as HZN1, which caused the zombie apocalypse . Working at a lab in Fort Collins, Colorado and using samples he gathered from Krokodil addicts in New York, Ebola camps in Africa, abandoned bioweapons in Kazakhstan, and brain matter from a man in Haiti, he created the "Red Death" virus, meant for use in biological warfare . The virus escaped the lab by infecting a lab technician named Brandon Doyle . From there it spread, and in the resulting chaos, Kurian fled and went underground . The right side of his face appears scarred from the nuclear blast in the season 2 premiere . </Dd> </Dl> <Dd> Dr. Walter Kurian, the main antagonist of season 1, is first encountered in episode 13, "Doctor of the Dead". Kurian is revealed to be responsible for the virus known as HZN1, which caused the zombie apocalypse . Working at a lab in Fort Collins, Colorado and using samples he gathered from Krokodil addicts in New York, Ebola camps in Africa, abandoned bioweapons in Kazakhstan, and brain matter from a man in Haiti, he created the "Red Death" virus, meant for use in biological warfare . The virus escaped the lab by infecting a lab technician named Brandon Doyle . From there it spread, and in the resulting chaos, Kurian fled and went underground . The right side of his face appears scarred from the nuclear blast in the season 2 premiere . </Dd>

Who died in season 4 of z nation