A Framingham man was killed in a one-car accident early yesterday when his Nissan went off Route 9 eastbound into the woods near the Walnut Street intersection, police said. Daniel C. Mearian, 53, of Melrose Street, Framingham, was driving along the road at about 6 a.m. when the car veered off and struck several poles, ending up about 30 feet into the woods, police said.