http://mcadams.posc.mu.edu/russ/jfkinfo4/jfk12/hscawtns.htm#upperEXCERPTS:
Mrs. Carolyn Walther was interviewed by the FBI on December 4, 1963, and stated that at the time of the motorcade, she was standing on the east side of Houston Street, about 50 or 60 feet south of the south curb of Elm Street.(10) After the ambulance left with the epileptic, Mrs. Walther looked up at the windows of the Texas School Book Depository and saw a man in the southeast corner window of the fourth or fifth floor; according to the FBI report, Mrs. Walther was "positive" the window as being the "most easterly" on the south side of the building.(12)
Mrs. Walther saw the man was holding a rifle in his hands; the barrel of the rifle was pointing downward and the man was looking toward Houston Street.(13) Both his hands were extended across the window ledge.(14) She described the man as having light brown or blond hair and wearing a white shirt.(15) She described the rifle as having a short barrel and being possibly a machine gun. She noticed no other features of the rifle.(16)
Mrs. Walther said also that she saw at the same time a second man standing in the same window to the left of the man with the rifle.(17) This man was wearing a brown suit coat; she could only see his body from the waist to the shoulders and his head was hidden by part of the window.(18)
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>>> And another one flies over the cuckoo's nest:
Mrs. Walther saw the man was holding a rifle in his hands; the barrel of the rifle was pointing downward and the man was looking toward Houston Street.(13) Both his hands were extended across the window ledge.
>>> Okay sure... assassins are going to expose themselves in such a manner even before the f'kn motorcade arrives. Good catch, Mrs Walther.