Police hunting the killer of James Attfield, who was stabbed more than 100 times in an attack in a park in Colchester, have issued CCTV images of 23 potential witnesses.
They're pictures of people who were in Castle Park in the hours before Mr Attfield was found dying early on the morning of Saturday 29 March. Essex Police believe they might have vital information.
James Attfield was the victim of what police describe as a violent, frenzied attack, stabbed in total 102 times. The father of five lived in sheltered accommodation in Colchester.
A car accident four years ago left him with a brain injury affecting his reasoning and speech; he known to be shy and polite.
Click below to watch a report by ITV News Anglia's Hannah Pettifer