S4·E1 The Hero Heart

In a surprise twist following the suspenseful season finale cliffhanger, Mickey jumped in front of Lu and took the bullet for her; saving her life. Lu quickly rushes him to the hospital but little can be done to save his life besides putting him on a respiratory machine. Andy and Bob try to convince Lu to take him off the respirator. While Lu deals with the emotional trauma of Mickey's death, Andy tries to perform an experimental procedure on a baby in a bubble but is interrupted by Bob with news that the FDA has un-approved the procedure. Meanwhile Andy gets herself into a bureaucritical battle when she tries to get a patient who has no health insurance a free heart transplant. Also, Andy must tell Lizzy and Jesse that she and Les are getting a divorce and that he is moving across the country.