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J) This is an art piece depicting John Lennon's death on December 8 1980. This is a secondary source because it's a piece of art that was supposed to be the scene of what happened from the event but it's not made by someone who was there.

It's a secondary source because it was made by someone who went off of different sources to make this.

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E) This is John Lennon's death certificate after he was assassinated. It has the information directly from him from when he died. It's also a government document.

This is a primary source because it is the actual data conceived after he died. And exact data.

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I) This is a biography written about John Lennon and his life including his assassination. It's a biography because it was written about John Lennon by someone who wasn't John Lennon about his life.

This is a secondary source because this is a source written by someone else who wasn't there for the event who gathered their information from other primary sources.

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H) This is a newspaper from the trial of John Lennon's death for his killer, where he was sent 20 years with a chance of parole in 2000. It has information from other primary sources, but the actual writers weren't there.

It's a secondary source because it is summarizing what happened in the court room with Mark Chapman, John Lennon's assassin after the event took place. This source is based off previous primary sources that occurred earlier.

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D) This is a video from the night John Lennon was murdered. The video was taken during the scene of the event.

It's primary source because it is a video during the actual event. It holds the events that happened and the individuals during that time period.

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He was shocked late this evening in front of his apartment building in New York City. Apparently he was killed almost immediately a man who shot John Lannan walked up to the musician as he was leaving his limousine. According to eyewitnesses who said Bristol and on. And then fired at him point blank at least five times. Standing by now in New York with more details is ABC's Linda Asher. John Lennon was murdered on his way home just outside the celebrated Manhattan apartment house the Dakota where he lived with his wife Yoko Ono and a five year old son. Apparently he stepped out of the limousine and headed through the gates towards the vestibule when a man emerged and fired seven times. According to police sources at the man had been seen at the apartment house earlier and later in the evening when Lennon arrived. The man appeared to be rational he called out Lenin's name then crouched police sciele. And fired. The four cops pulled John Lennon out and put him into the back of a police car and is now he was bleeding from his mouth anything he was terrible site. John Lennon's body was immediately rushed in a police car here to Roosevelt hospital just thirteen blocks away from his apartment in upper Manhattan. He was dead on arrival they tried resuscitation and they tried transfusions. But nothing works if you. Had multiple gunshot wounds in his chest. In his left arm and in his back. There were seven wounds in his body. And implement. I don't know exactly how many bullets there where there were seven. I could. There was a significant injury the major vessels inside the chest which cause there. Massive amount of blood loss which probably resulted in his death. Do you lose consciousness I don't know evenly in all I'm certain that I would elderly woman died first shutout. Students that didn't stop a number of Lennon's fans from gathering at the hospital land at his apartment house. To pray. And to remember. Insurer ABC news New York. John Lennon was shot a well known New York apartment building the Dakota house on. West 72 street and ABC's Rita sends a standing by live at the Dakota now. We don't want to what have you been able to learn since the shooting. Greater sentence than your image. I don't know you're on. Great instead what we know about this suspect at this time is first of all his identity 25 year old Mark David Chapman. He comes from Hawaii police tell me he's been to the New York area about a week. And began to hang around the Dakota apartment over the weekend asking about John Lennon. He apparently ran into him up for the first time this evening about 5 o'clock. Asking Lenin for his autograph Lenin gave it to him on the jacket cover the idea of a record. Lennon went off to a recording session and we are told that Chapman no remained at the hotel. Until mr. Lenin returned about 11 o'clock this evening. Police officials. Describe what happened this way they say the Chapman came up from behind. Yeah about mr. Lennon's name and ante to 38 revolver. There were at least five shots spent they were seven gunshot wounds three. Considering both in entrance and exit wounds. The worst damage came from the chest wounds. Lenin they shouted that I know I've been shot he stumbled up several steps into the Dakota and collapsed inside and an office area. And was taken immediately to Roosevelt hospital where we are told he was dead on arrival. There is little known about that 25 year old Chapman only that he's been staying at a local YU. Several days and then another hotel in the last a day or two. I he has have been taken to the twentieth police precinct. Fingerprinted they're checking for prior arrest records also allowed for any. Know him. They don't have any yet there they charged him officially would murder but the reason for this attack. Unknown. Yet. Accurate sense.

This transcript has been automatically generated and may not be 100% accurate.

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Video: ARCHIVAL VIDEO: John Lennon Killed in 1980

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He was shocked late this evening in front of his apartment building in New York City. Apparently he was killed almost immediately a man who shot John Lannan walked up to the musician as he was leaving his limousine. According to eyewitnesses who said Bristol and on.

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A) This was the gun that was used to kill John Lennon. It's an artifact because it's the actual gun used to kill John Lennon and was physically there for the event. He was murdered for declaring the Beatles were more popular than God himself.

This is a primary source because it is an artifact. The gun was the actual object used for the assassination and the time.

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B) This is the information from the time when John Lennon was murdered. It's a picture from the times after he was killed directly from the event.

It's a primary source because these were materials from the time of the person or event being researched. And the photos were taken during the event, that's how you know it's a primary source.

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C) The taxi driver was parked in front of Dakota, where John Lennon was assassinated (Paragraph 9). It's an interview with her and what she exactly saw because she was a witness for the murder.

This is a primary source because it is an interview with a person who witnessed the event with their own eyes.

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The first police responders on the scene also speak to the documentary, along with the doctor who treated Lennon at the Roosevelt Hospital and the nurse who broke the news of the star's death to his wife, Yoko Ono.

The title of the series refers to the fact that Chapman pleaded guilty to second-degree murder on the eve of his trial. He was sentenced to at least 20 years in prison and has repeatedly been denied parole.

The series director, Nick Holt, said: "I felt that a lot of people directly involved in the case were getting on a bit now and if we didn't capture and gather them into a series, their testimony would be lost forever."

The producer

Lennon spent his final hours at a recording studio where he had begun work on a new single. Jack Douglas, his producer, tells the documentary: "He was on top of the world. The last I saw of him was getting in the elevator. As the elevator door was closing, he was standing right in front of me with this big smile. He was so happy about how everything was going. It had been a glorious day and he just said to me, 'I'll see you in the morning, 8am.' Happy as a lark."

The taxi driver

Cab driver Richard Peterson was parked outside the Dakota and witnessed the shooting. "Lennon was walking in and this kid says, 'John Lennon.' He was a chunky guy. I'm looking at him through the front window of my cab. I'm looking at him shoot him. This guy just shot John Lennon.

"I thought they were making a movie, but I didn't see no lights or cameras or anything so I realised, hey, this ain't no movie."

The concierge

Jay Hastings, who worked on the front desk at the Dakota building, heard Lennon's last words. "He runs past me. He goes, 'I'm shot.' He had blood coming out of his mouth. He just collapsed on the floor. I half rolled him to his back and took his glasses off, put them on the desk. And Yoko was screaming, 'Get an ambulance, get an ambulance, get an ambulance.'"

The police officers

NYPD officer Peter Cullen arrested Chapman, who had remained at the scene clutching a copy of The Catcher In The Rye. "We put the cuffs on him and it was strange: there was no resistance at all. He actually apologised to us. He said, 'Gee, I'm sorry you guys, I ruined your night.' I says, 'You gotta be kidding me. You know you just ruined your whole life?'"

Herb Frauenberger, another NYPD officer, tended to Lennon: "Somebody is yelling, 'There's a guy shot back here.' So we go in and the first thing I see is a man laying on the floor. I turned his head just a little bit so I could try to feel for his pulse, and he had a very faint pulse... and then it hit me. I said, 'Holy smokes, this is John Lennon.'"

The medical staff

Dr David Halleran treated Lennon when he was rushed into the emergency room at Roosevelt Hospital. "I go running down there and they say, 'We have a gunshot wound.' We're working on him, pumping his heart, and it's like, 'My God, that is John Lennon.'

"Your hands are on the heart and you're squeezing it - just keep pumping. The hope is that you get some flicker of life and unfortunately it was just not enough. I think the total time was about 45 minutes before it became futile and we called it and stopped... You feel like you failed."

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Witnesses to John Lennon's murder speak for first time

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The series, John Lennon: Murder Without A Trial, includes interviews with witnesses to the shooting on 8 December 1980 and its aftermath

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F) This is a documentary detailed the events that happened when John Lennon died. It has the information from the night used by other primary sources to make this. He was on his way home with his wife when he was shot.

It's a secondary source because it was created after the assassination by someone else. Someone who wasn't a witness of the assassination or there directed it.

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The Man Who Shot John Lennon (True Crime Documentary) | Real Stories

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G) This is an article written about the day he died. It has all of the stories of what happened that day.

This is a secondary source because it is written by someone else who wasn't there for the event. They don't really know what happened and are just going off other primary sources. So it's 100% accurate information.

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John Lennon: shocking murder re-examined in TV documentary

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New first-hand accounts offer fresh insight into killer Mark David Chapman in ‘definitive’ telling of assassination