EditorialTimothy Ray Brown, in Seattle, March 3, 2019, the first person cured of HIV, through an experimental bone marrow transplant. In 2007, he received a bone marrow transplant from a donor who was immune to HIV. He died on Tuesday, Sept. 29, 2020, at his home in Palm Springs, Calif. He was 54. His partner, Tim Hoeffgen, said the cause was unrelated recurring leukemia. (Grant Hindsley/The New York Times)