The plain simple Truth:
*The wrongly-accused was standing outside on the steps of the front-entrance when the cowardly ambush of a duly elected representative of the People took place.
*12:33 Seen by a small storage-room on the first-floor by more than a few of his fellow TSBD employees returning into the building.
*12:34PM: Came to the aid of Inspector Sawyer (as no other TSBD male-employee-experience--movements/whereabouts that afternoon can account for being near that small storage-room and passenger elevators at that particular time).
*12:38PM: Upon stepping outside of the building via the front-entrance, he took a few seconds to point out where a rookie news reporter could find access to a telephone, before joining his supervisor, Mr. Shelley, down on lower Elm Street for 5-10 minutes...(thanks to Mr. Mentesana's home video capture).
Moreover, the only time the public was able to actually experience/listen & watch any audio & video recording of the wrongly-accused, he made it crystal-clear he was innocent ---->
In addition...
It was following these exchanges with audio & video recording available for public-consumption that those framing him cleverly decided to void any further audio & video recording...choosing instead to put words into his mouth about what he said and what he did, yada, yada, yada along a hastily contrived script mired in the stench of horse manure to Frame him.
The wrongly-accused did Not shoot anybody. Anybody.