Police believe this man may have been a key witness to a fight in Northampton town centre which left a 61-year-old fatally injured.
It is thought George Wedderburn, of Byfield Road, St James, was injured after intervening in the fight at Abington Square in the early hours of last Sunday.
He died six days later in hospital.
Police have released this image of a man they think may have tried to act as a peacemaker.
Officers would like him or anyone who knows him to contact them on 101.
Daniel Tero, 22, of Burleigh Road, Kingsthorpe Hollow, has been charged with assault.
He is due to appear at Northampton Crown Court on Wednesday September 3.
More top news
Former New Zealand 'All-Black' recounts 1987 win and playing at Franklin's Gardens
Any remaining wintry showers will ease tonight but it will stay cold and there's a risk of frost and icy patches developing.
The snow that's hit the North of England reached this East albeit briefly on Thursday afternoon. Here are some of your pictures.