An emergency room doctor at New York Presbyterian Hospital has touched the hearts of millions after a personal letter he wrote about the death of a patient went viral on the Internet. The letter was first published on Reddit by the son of the deceased woman, who reportedly died of breast cancer in December 2012. In the letter, the doctor explains that this is the first such note he has written in 20 years of ER work. The letter has already been viewed by more than 2 million users on Reddit, with thousands leaving comments.