George Barnes was last heard from on 21 June
Austin left Peterborough hospital and has not been seen since
The death is not being treated as suspicious
He was reported missing on Sunday, February 4 by staff at the Ferry Project, Wisbech
DI Rich Stott said: 'We are extremely concerned about David’s whereabouts'
Call 999 if you have seen David or know where he is
Police hunt for missing man ends following discovery of a body
A 36-year-old man who left Peterborough City Hospital at 2am on April 8 has been found. Police had issued an appeal to find him.