the 21st century forensic crime show treatment, it would be solved by a show like csi in an hour. five decades later, conspiracy theories thrive. i would not want to be considered to be a believer that one person did this alone when that was impossible. reporter: to this day, robert groeden preaches conspiracy on the grassy knoll every weekend. he is dedicated his life to the kennedy assassination, consulted the house committee on political assassinations in the 1970s, even had small parts in oliver stone s film, jfk. he moved to dallas almost 20 years ago just so co-deem fighting the warren commission s conclusion that lee harvey oswald acted alone. oswald could never have been convicted. that s why they had to kill him. where do you think the shots came from? well, shots came from at least four different directions. this is the result of about 12 different locations of
parts of it kreeng across the plaza striking the curb and ricocheting out and hitting a third victim. a man by the name of james, who suffered a minor face wound. if you fragment is bullet, that is within the realm of possibility for them to deflect and travel that distance. reporter: but today, james tag doesn t believe that story. he thinks there was another shooter and more than three shots fired. they were not going to mention the shot. so they had to go back and fit a missed shot in there. and that s when they came up with the magic bullet theory. that the hole in kennedy s back reporter: mike said he did not find any physical evidence of a second gunman or clues that shows shots were fired from a second location. for robert groden and conspiracy theorist who s still flock to the grassy knoll five decades later, this still isn t enough. people come because they know something is wrong themselves wanted to come and find out and