Schizophrenia can affect people throughout the lifespan although new instances of the illness are most likely to occur in early adulthood.
It is relatively rare for children and older adults to develop schizophrenia, but it does happen.
On the day he was freed, Barry spent more than four hours drinking in local bars before returning to his flat in Wells Road shortly before midnight.
Police said he had consumed at least a litre of rum by 2am, when he climbed the stairs to the second floor and knocked on Mr Ahmad’s door.
“We have reviewed and strengthened our ways of working with other service providers, including the police, to improve our sharing of clinical and additional relevant information.” John Hoskinson, chief executive of the Milestones Trust, said an internal review was being conducted into the case alongside NHS England and the Bristol Safeguarding Adults Board.