Fresh appeals have been made over the death of a man found badly burnt under a railway arch four years ago.
The scorched body of Kester David, 53, was found in an archway behind the Travis Perkins building in Bloomfield Lane, in Palmers Green, on Wednesday, July 7, 2010.
The part time bus driver and keen DJ appeared on CCTV entering the shop at Texaco service station, in Lordship Lane, Wood Green, the night before his death at 9pm.
He bought petrol in a jerry can but when he tried to put it in his Ford Transit, his van had broken down. The RAC fixed his van by 11pm.
Four hours later, a black man is seen on the footage entering the same petrol station and also buys petrol in a jerry can.
A man was then seen at 3.55am wearing the same clothes as the man at the petrol station, carrying a jerry can walking along Green Lanes, towards Broomfield Lane.
At 4.20am, a bright light was seen on Travis Perkins’ CCTV come from under the arches. Residents heard screams coming from that area.
Mr David’s body was found the following morning. Police say the area where is body was found is difficult to get to and can only be reached by climbing over a metal fence or walking down a steep concrete embankment.
His mother, who is 80 years old, has made a plea to the public to come forward.
She said: "When the detectives informed me that the burnt body of a bus driver had been found, the one thing I hoped in my heart was that he was already dead when he was set alight. No mother should have to bury their child under such horrifying circumstances.
"I appeal to anyone out there who may have heard his cry for help or seen anything unusual on the night of July 6 to 7, 2010 to come forward however small the information. I am sure a third party was involved and they must be stopped from doing this again."
Detective Chief Inspector Noel McHugh, who is leading the investigation, said: "Kester was a hard working, well-respected individual in his local community and I am committed to finding out why he died.
“Despite continued efforts to identify the circumstances surrounding Kester's death, it remains unexplained and we appeal to anyone who can assist with information to come forward
“Kester's mother is now 80 years of age and one can only imagine the agony she has endured since July 2010 not knowing why her son died."
Detectives have made an appeal tonight on BBC1’s Crimewatch for anybody who knows what happened to Mr David the night of his death.
The police are keen to speak to a man who answered Mr David’s phone two days before his death.
They are also keen to find Mr David’s phone, a Blackberry Curve, which was used on July 14, and 15, 2010 in the Wood Green area.
Two weeks after his death, the Enfield safer neighbourhood team received an email from someone called ‘Sharon’ who claims to know who was responsible. The police are anxious to speak to this person.
Anyone with information should call 020 8785 8099.