JFK assassination: 50th anniversary

Alex Marquardt looks back at one of America's darkest days.
1:39 | 01/12/13

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Transcript for JFK assassination: 50th anniversary
This year will mark the 50th anniversary of one of america's darkest day, the assassination of john f. Kennedy. Half a senchly later, a well-known kennedy has visited dallas and offer some thoughts. On that fateful day. Here's abc's alex marquardt. Reporter: In the wake of president john f. Kennedy's death, his brother robert was reeling, struggling to understand how it could happen. There is the weapon that was used to kill the president. Reporter: And privately rejecting the lone gunman theory of the warren commission, which he reportedly called a shoddy piece of craftsmanship. This, according to robert kennedy jr. Who surprised a dallas audience last night at an event ahead of the 50th anniversary of the assassination of his uncle there. The evidence at this point is very, very convincing that it was not a lone gunman, he said. He was quote, fairly convinced. This was a military-style ambush from start to finish. With lyndon johnson waiting in the wing. Reporter: The 1991 hit film "jfk" fueled and explored conspiracy theories around the evidence. I don't find them credible. It's been investigated. Reinvestigated again and again. And no one has ever come up with entirely credible evidence. Reporter: Robert kennedy jr. Also thinks his father, who was attorney general at the time, felt some guilt, because he believed there could have been a link with his aggressive work against organized crime. David? So rare we hear from the kennedys on that day.

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

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