Police investigating a hit and run that left a man with catastrophic injuries have released CCTV of the collision as they appeal for the public's help to trace a man.At around 2.30am on Tuesday 21 August 2012, police were called to John Dalton Street, following reports a silver Vauxhall Corsa had collided with three pedestrians before driving off.It is believed the car turned left onto Deansgate and drove towards the south side of the city.One of the pedestrians, Michael Ward who was 28 at the time, received serious head injuries and was taken to hospital where he remains.A 30-year-old man received a broken leg and a 32-year-old man received superficial injuries.It is believed two groups of men left Silks club on Lloyd Street moments before the collision.A group of men then walked towards Clarence Street, where it is believed they got into the car involved.As the other group was crossing John Dalton Street the car ploughed into them before driving off, leaving three men seriously injured in the road.Following the incident police arrested six people: five men and one woman. They remain on police bail.Police have now issued an image of a man they wish to trace in connection with the incident.Maryrose Ward, the wife of Michael said: "The impact this has had on our lives has been truly devastating and our three children have been left with broken hearts. I go and see Michael everyday at the hospital and it is deeply upsetting to remember him how he was before the incident and to see how he is now."I would appeal to anyone who may have witnessed the collision or who recognises the man in the image to contact the police as soon as possible. You may think the information you have is irrelevant and not helpful but any detail you can supply could be vital in the investigation."Detective Constable Marie Eldred, said: "While three men were injured, Michael in particular has suffered catastrophic injuries that he will never fully recover from."He and his family have been left totally devastated and it is important that we get justice for them."If anyone knows anything about the incident, those in the car or thinks they recognise the man in the CCTV image please get in touch."