After several desperate attempts to keep his old mentor alive, Dr Halstead realises he needs to let her pass to relieve her pain.br br Season 2 Episode 18 "Lesson Learned" br Dr. Halstead makes quick and difficult decisions when tending to a patient who was also his mentor in medical school. Dr. Rhodes performs a risky surgery on a young boy as an alternative to amputating his arm. Meanwhile, Dr. Charles and Dr. Reese tend to a patient who denies having suicidal tendencies. Also, Maggie takes an aggressive route when training a new nursing student and Dr. Reese continues to mourn the loss Jason Wheeler.br br Watch full episodes Of Chicago Med on Google Play: Watch full episodes Of Chicago Med on Itunes: Follow for more videos from the Chicago heroes.