While his cause of death has not been confirmed, one possibility is skin cancer. Carter battled with Stage 4 melanoma in 2015.

Carter’s successful cancer treatment “would have been considered ... at least 15 new treatments for stage 4 melanoma have been approved, said Dr. Michael Davies, chair of the department ...

"I thought I had a few weeks left," he said of the brain tumor discovery, "but I was at ease. I've had a wonderful life. I've had a gratifying existence." ...

With breakthroughs from melanoma to pancreatic cancer, this has been a year of great promise in the field of cancer vaccines.