Julian McMahon’s cause of death has been ruled as natural and that he “died from lung metastatis as a result of head and neck metastatic cancer.” This means that the cancer first formed in the head and neck and then spread to the lung.

A cause of death has been revealed for Aussie actor Julian McMahon, who played Dr. Doom in two “Fantastic Four” movies and Christian Troy in the TV drama “Nip/Tuck,” among other roles. McMahon died of cancer, according to a statement from Kelly McMahon, his wife.

Actor Julian McMahon, best known for his roles in "Nip/Tuck" and "Fantastic Four," has died at age 56 after a "valiant" battle with cancer.