Missing Jack O'Sullivan's mum has been filmed walking and discussing the route he was last seen taking in Bristol before he disappeared.br br Catherine O'Sullivan is videoed talking about the evening her son vanished after leaving a party more than six months ago. br br Multiple searches by police and organised privately by the family have failed to yield significant answers - and his disappearance remains a mystery.br br Jack, 23, was last seen at 3.15am on Saturday March 2 in the area of Brunel Lock RoadBrunel Way, in Bristol.br br His mother has been filmed on the route CCTV showed him taking that night - with the videos posted on the 'Find Jack' campaign Facebook page.