Crimestoppers and the Association of Convenience Stores (ACS) have offered a reward of up to £10,000 for information leading to the arrest and conviction of a man involved in the death of retailer Arulchelvam Prasanna.

Arulchelvam was found with severe head injuries in a Costco car park in Watford in May of last year. He was rushed to St Mary’s Hospital, London, but died of his injuries 11 days later.

Two men have already been sentenced to a total of eighteen years in prison for the manslaughter of the father of one. Patrick O’Driscoll, 34, from Hertford, was given ten and a half years and James O’Driscoll, 45, from Roydon, was given seven and a half years.

However a third man, Michael McInerney is still wanted by Bedfordshire Cambridgeshire and Hertfordshire Major Crime Unit. McInerney, of no fixed abode, was arrested in connection with the incident but failed to answer bail.

Crimestoppers regional manager Ann Scott said: “This was an extremely serious offence where a young man tragically lost his life. Michael McInerney continues to evade police and it is vital that he is found.”

Chief executive of the ACS James Lowman added: “After this horrific crime, we have agreed with Crimestoppers and the police to make a reward available. We hope that this reward will help with the investigation and bring to justice all those responsible for the murder of Mr Prasanna.”

Crimestoppers can be contacted on 0800 555 111 or through its Anonymous Online Form.