Missing Long Island teen Thomas Medlin was caught on surveillance video pacing the Manhattan Bridge — moments before the cameras recorded an ominous splash in the East River, Suffolk County police revealed Wednesday. Cops stopped short of saying that the 15-year-old boy from St. James — who vanished after leaving school on Jan. 9 — somehow plunged into the icy waters, but noted that the footage does not show the teen leaving the bridge. 4 Thomas Medlin, 15, left school on Long Island on Jan. 9 and headed into Grand Central Terminal. Suffolk County Police Department4 Suffolk County police said Medlin was last seen on the Manhattan Bridge hours after leaving his school on Jan. 9. 4 Police initially believed Thomas Medlin was meeting a friend he met on the gaming platform Roblox.