>> crime lab lieutenant jayce day just came out of that building with a british .303 rifle. >> it was a 7.65 mauser. >> a high-powered army or japanese rifle. >> a .3030 rifle. >> much of the first things you hear are going to be wrong and to some degree you were constantly trying to separate out what seemed to be a fact. >> in dallas, a dallas policeman just a short while ago was shot and killed while chasing a suspect. >> j.d. tippit was shot three times in the chest in the oak cliff section of dallas. then the manager of a shoe store saw the suspect walk into the texas theater. >> someone has been arrested in one of the downtown theaters. they don't know if it was the man who shot the policeman or the person who actually shot president kennedy.