Robert Canon, 52, was last seen October 9, 2011, at the East Pleasanton BART station in Pleasanton, California, after visiting the Bay Area with a friend for a convention. He was scheduled to take BART to San Francisco International Airport for a flight back to Oklahoma but never boarded that flight; Delta Airlines confirmed he did not check in.

Shortly after his disappearance Canon’s backpack, containing his cell phone and laptop, was found on the Golden Gate Bridge. Investigators confirmed Canon was on the bridge but he was not seen exiting and his clothing bag was never recovered. Authorities have not ruled out foul play. Despite searches and investigations, no further information about his whereabouts has surfaced.

If anyone was in the East Pleasanton BART station or on the Golden Gate Bridge that morning and remembers seeing Robert Canon, please come forward with details.