Mr Charlton died following an incident in Grey's Nightclub, off Grey's Street in Newcastle, in September last year.

The 41-year-old was at the nightclub on the evening of Friday, September 14.

Then at 2.28am in the early hours of Saturday, September 15, following an incident on the stairs inside the club, he suffered serious injuries which proved fatal.

Police have examined CCTV footage from the nightclub and have found images of individuals who may be vital witnesses.

Police are appealing for these people to come forward and make contact by calling 08456 043043 or Crimestoppers on 0800 555111.

It is believed they may be able to shed some light on the incident which led to Mr Charlton's death.

Only last week the murder was highlighted on BBC TV's Crimewatch.

David's fiancee Alison Small and his sisters went in front of the cameras to appeal for any witnesses who may have seen the construction supervisor's fall to come forward to help piece together what happened.

And before the end of the show two of the men and one woman captured on CCTV that police were looking to speak to had phoned in.

Two Gateshead men, aged 35 and 44, have both been arrested on suspicion of murder and conspiracy to pervert the course of justice.

They have both been bailed pending further enquiries.

The 41-year-old died when he fell on mezzanine stairs in Grey's Club in the city in the early hours of Saturday, September 14.

Northumbria Police have released three CCTV images taken in the club on the night of Mr Charlton's death and are hoping they will help jog someone's memory.

David's fiancee Alison Small and his sisters will this week face the cameras to appeal for any witnesses who may have seen his fall to come forward to help piece together what happened.

Police are still looking to trace a man wearing a white tshirt who was seen in the foyer of the club just before 2.30am.

Two men aged 35 and 44 from Gateshead were arrested on suspicion of murder and bailed pending further inquiries.

Police have only managed to trace some of the 150 revellers who were in the club at the time of the incident.

Anyone with any information is asked to contact police on 08456 043043 or Crimestoppers on 0800 555111.