His name is Gene Sprague. He paces the Golden Gate’s walkway at its highest point, occasionally stopping to gaze down at the water more than 200 feet below. Immersed in their picture-taking, nearby tourists fail to notice him. His pacing stops, he brushes his long black hair from his face, pushes himself into a sitting position on the handrail, pauses for a moment as if to reflect one last time on what he is about to do. Abruptly, he rises…