The one shot he heard above the 5th floor could have been a shot by another Ex Marine , Malcolm Wallace who could have hit John Connally since Connally's wounds had more of a downward trajectory .
You might be right, Mike..... I have no idea who the 165 to 175 pound man in his early thirties, who was dressed like a deputy sheriff in khaki clothing, could have been.... But I'm sure that he was NOT carrying a Mannlicher carcano..... Because both Howard Brennan and Arnold Rowland described the rifle as a HIGH powered rifle or a hunting rifle....
Would the description provided by Howard Brennan fit Malcolm Wallace?.....