By Jenni Davidson
Jonathan Puplett, 33, from Brighton, was on an escorted walk from Mill View Hospital in Nevill Avenue, Hove, where he is a patient.
He refused to go back to the hospital and was last seen about 1.15pm yesterday (Thursday 13 February).
Mr Puplett is described as white, 5′ 10″, of slim build, with short light brown hair and he was wearing a black coat, brown t-shirt and jeans.
Police are searching the area and ask anyone who has seen Mr Puplett or knows of his whereabouts to phone 101 quoting serial 0702 of 13/2.