Mr Tom Alyea, from Ms Connie Kritzberg's Secrets from the Sixth Floor Window------------------
"I [followed] the search team that was on its way to the rear elevator, to start the floor by floor search. We searched every floor, all the way to the roof. The gunman could have still been in the building. Finding nothing, they started back down. After approximately 18 minutes, they were joined by Captain Fritz, who had first gone to Parkland Hospital
[...]
Captain Fritz joined us on the 5th floor and aided in the search
[...]
I filmed Captain Fritz talking with associates in this dismantled area (the "sniper's nest"), along with Studebaker, who was dusting the Dr. Pepper bottle which had been brought up to him from the 5th floor."
Leaving aside for the moment the sheer absurdity of several witnesses pointing officers to the correct window and yet not a single officer thinking to check out that window, let us note a key fact here: Mr Alyea was present for the first search of the sixth floor before Captain Fritz's arrival on the scene.
I believe the only thing 'found' on that FIRST sweep was lunch remains on the fifth floor-----by the window ERRONEOUSLY identified at first as the window witnesses had seen the shooter fire from