. >> my old kentucky home steven foster. >> that is correct. lead belly. >> reporter: lead belly even wrote a song about his stay at the hospital. >> i went one morning in bellevue. i saw miss johnson. must have been a nurse. she was new. so long. >> reporter: and singer john lennon was brought here after he was shot, along with his assassin. >> and one of the great ironies of the story, mark chapman was being examined by psychiatrists probably 100 feet away from where john lennon's body was in the morgue. >> reporter: but it was the 1989 murder at bellevue of dr. katherine hement that shook the institution to its core. >> a homeless man who had been living illegally in bellevue hospital killed a pregnant pathologist in her office. and it caused an absolute furor. and bellevue really had to decide at that moment, are we a hospital that provides emergency services to everybody, or are we a bus station? >> reporter: in the end, security was ramped up and bellevue did not abandon its mission as a public hospital. dr. susan cohen has been at the ho

henry sent to bellevue, steven foster. >> my old kentucky home, steven foster? that is correct.d belly. blues legend lead belly even wrote a song about the hospital. and singer john lennon was he a along with his assassin. beg exam by pshiatrists prob 1dy was thgue. it was the 1989 murder at bellevue of doctor kathryn hinnant that shook the institution to its core. >> a homeless man, who had been living illegally in bellevue hospital killed a pregnant pathologist in her office. and it caused an absolute furor. and bellevue really had to decide at that moment are we a hospital that provides emergency services to everybody, or are we a bus station? >> in the end security was ramped up and bellevue did not abandon its mission as a public hospital. dr. susan cohen has been at the hospital for 12 years. >> i love the people. i love the patients. and i love the mission you have to wanna be here to be here. if it's not the right fit >>t the bellwet it is eand y ve a mal kes in people issue, it will be taken care of with great care and compassion. >> over the course of the morning we ha