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The mother of murder victim John Pordage has made an emotional appeal for help in tracking down a teenager police want to question.
John Pordage, 34, was shot dead at a petrol station in Chelmsford on Saturday 5 August.
Speaking at press conference held by Essex Police his mother, Sue Wilson said: "To lose your child is unimaginable, to lose your son so violently and needlessly is beyond words."
She appealed for help in tracking down a man police want to talk to in connection with the shooting.
Detectives are continuing to appeal for information to trace Bradley Blundell who they want to question in connection with the murder.
Blundell was last known to be living in Chelmsford and has links to the Great Baddow and Thurrock area. He also has links to the Norwich area.
Crimestoppers is offering a reward of up to £5,000 for information on the whereabouts of 17-year-old Bradley Blundell.
Five arrests were made in connection with the murder investigation.
A 16-year-old boy from Chelmsford has been charged with murder, possession of an offensive weapon, handling stolen goods and perverting the course of justice. He has been remanded in youth custody until a court hearing in October.
An 18-year-old man was charged with four firearms offences and a charge of handling stolen goods.
The three other people arrested on suspicion of assisting an offender have been released under investigation.