emergency room doctor pronounces john lennon dead. >> former beatle john lennon was gunned down in front of his exclusive manhattan apartment. >> ending the life of a folk hero. >> the co-op building where he was gunned down as he -- >> the news ripped through the air in shock waves. john lennon shot and killed in the dakota apartment building. >> it was really shocking. >> 40 years old. >> how could he be dead? how could this have happened? >> the city was in shock. not just people my generation that grew up listening to their music in the '60s. i think just about everybody felt that on so many levels it was wrong. >> it was terrible. i mean, i think just the way so many people that didn't even know john felt. and it just hit home with me much more because he befriended me and he didn't have to befriend me. >> in new york cnn investigative reporter laura dedio has come up with some new facts about john lennon's accused killer. >> the killer was identified as