A Norridgewock man is missing after he walked away from a Bangor psychiatric center. Graham Lacher, 37, was a voluntary patient at Dorothea Dix Psychiatric Center but is not considered involuntary, according to Shannon Moss, a spokesperson for the Maine Department of Public Safety. Lacher was last seen about 4:40 p.m. Monday walking away from the State Street facility, Moss said late Monday night. A police dog tracked him as far as the area around Eastern Maine Community College. Lacher was described as 5-foot-11 and weighing 265 pounds.