"Do you know who you are?" Lennon nodded, but could only manage to make a moaning and gurgling sound when he tried to speak, and lost consciousness shortly thereafter. Resuscitation attempt A few minutes before 11:00 p.m., Moran arrived at Roosevelt Hospital with Lennon in his squad car. Moran was carrying Lennon on his back and onto a gurney, demanding a doctor for a multiple gunshot wound victim. When Lennon was brought in, he was not breathing, and had no pulse. Three doctors, a nurse, and two or three other medical attendants worked on Lennon for 10 to 20 minutes in an attempt to resuscitate him. As a last resort, the doctors cut open Lennon's chest and attempted manual heart massage to restore circulation, but they quickly discovered that the damage to the blood vessels above and around Lennon's heart from the multiple bullet wounds was too great. Three of the four bullets that struck Lennon's back passed completely through his body and out of his chest, while the fourth lodged itself in his aorta beside his heart. One of the exiting bullets from his chest hit and became lodged in his upper left arm. Several of the wounds could have been fatal by themselves, because each bullet had ruptured vital arteries around the heart. Lennon was shot four times at close range with hollow-point bullets and his affected organs—particularly his left lung and major blood vessels above his heart—were virtually destroyed upon impact. Reports regarding who operated on and attempted to resuscitate Lennon have been inconsistent. Stephan Lynn, the head of the Emergency Department at Roosevelt Hospital, is usually credited with performing Lennon's surgery. In 2005, Lynn said he massaged Lennon's heart and attempted to resuscitate him for 20 minutes, that two other doctors were present, and that the three of them declared Lennon's death. Richard Marks, an emergency room surgeon at Roosevelt Hospital, stated in 1990 that he operated on Lennon, administered a "massive" blood transfusion, and provided heart massage to no avail. "When I realized he wasn't going to make it," said Marks, "I just sewed him back up. I felt helpless." David Halleran, who had been a third-year general surgery resident at Roosevelt Hospital, disputed the accounts of both Marks and Lynn. In 2015, Halleran stated that the two doctors "didn't do anything", and that he did not initially realise the identity of the victim. He