Rosemary Willis (born 1953) was a close witness during the assassination of United States President John F. Kennedy.
At circa Zapruder film frames 164-171 (hereafter "Z-164-171"), she starts to slow down, then she stops running and, simultaneous with her slowing/stopping, she slightly turns her level-facing head to end up looking towards the southeast corner of the Texas School Book Depository.
Immediately after the upright-sitting President John F. Kennedy is first hidden at frame 207 by the "Stemmons Freeway" traffic sign in the Zapruder film, Willis suddenly, and beginning at Z-214, snaps her head very rapidly 90 to 100 degrees westward (completely away from the Depository southeast corner) within 0.16 second to then face Abraham Zapruder and the grassy knoll by Z-217.
At that same instant, he was still sitting upright, and his facial expressions and arms were already clearly displaying his physical movements and neuro-physical sensed reactions to his already having been impacted by a bullet sometime prior to Z-225.
Willis was also documented in the HSCA report stating that her father, military veteran Phillip Willis, became very upset when the Dallas policemen, sheriffs, and detectives ran away from the grassy knoll, after they had first quickly run onto the grassy knoll where he thought a shot had been fired from.