To this end, he used his credentials to get a job at the Red Cross and by 1944 he was stationed in Brisbane, Australia, where he oversaw the shipment of human blood to the battle fields of the South Pacific. Taking the blood donated by citizens of allied countries he transfused it into himself and left his own tainted blood in its place. This blood would then infect anyone it was transfused into with white gangrene. During his studies, he learned his assistant Mary Knoweles, the daughter of a high ranking military official, had the rare blood type that could possibly cure him. However, by the time he learned this, his tainted blood scheme was realized by the military who sent Captain America and Bucky to investigate. They arrived in Brisbane and questioned the doctor who did not provide them with any useful information. When Mary passed them a note asking to meet with them, Necrosis ordered his minions to run down the two heroes. When they failed, Necrosis broke up the confrontation and suggested the whole thing was a misunderstanding.
He then returned inside and forced Mary to his operating table to perform to the transfusion to cure himself and infect Mary with the disease. Captain America and Bucky arrived and were subdued by his spies and forced to watch as Necrosis began the operation. However, Cap and Bucky broke free and smashed through the window of the operating theater. During the struggle with Necrosis, the villain dived at Bucky who ducked out the way. Necrosis then landed on a pile of broken glass which pieced his heart, killing him.