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>> nobody. >> nobody. i believe i guess there reinforce an amalgamation and elements within the cia. >> so the cia and the mob working together is the theory that -- >> yeah. >> most people that really know the case are somewhere in that ballpark. >> that is the legacy that still hangs over dealey plaza, one of the most tragic events of the 20th century. still shrouded for many in mystery. ed lavandera, cnn, dallas. >> and we will be taking you live to dallas as the city honors president john f. kennedy on this 50th anniversary of his assassination. stay with us. we'll be right back. [ lane ] ...

Warren commission report. >> it's a fairytale. it didn't happen. no bullet went through both men >> reporter: to conspiracy theorists like robert groden, the single bullet theory is one of many problems with the official story. >> so the x there in the middle of the road? you put that down there? >> yes. i put that down there 19 years ago. >> reporter: groden grew up in new york and moved to dallas almost 20 years ago, proving the kennedy assassination conspiracy is his life's mission. you can find him on the grassy knoll every weekend, arguing his case. >> do people come out here and say, man...

>> nobody? >> nobody. there's i guess amalgamation between the mob and the elements in the cia. >> the cia and the mob working together is the theory that somehow -- >> most people that really know the case are somewhere in that ballpark. >> reporter: that is the legacy that still hangs over deely plaza, one of the most tragic events of the 20th century. still shrouded for many in mystery. ed lavendera, cnn, dallas. >> don't miss the cnn special "the assassination of president kennedy" tomorrow night at 9:00 eastern and pacific right here on cnn. and still to come, desperate for relief in th...