Police have arrested a man on suspicion of murdering Don Lock, who was today remembered as a “gentle, fair man”.

Donald Lock, 79, of Worthing, was killed on the A24 following an incident opposite the Wyevale garden centre at Rogers Farm just before 8.40pm.

Sussex Police said both men left their cars and the suspect, who was driving the auto in front, knifed the other driver before driving off. The victim was alone in his auto.

On Thursday evening 79-year-old Don Lock was murdered after getting out of his auto following a crash with another vehicle.

The 39-year-old mother-of-one, who retired from Sussex Police two years ago after working in Brighton for 11 years, said: “In all my years on the job I don’t expect that to happen a few hundred yards from where I live”. He was a keen member, in fact, he was the bedrock of the club for many, many years.

Adrian Palmer, secretary of Worthing Excelsior Cycling Club, of which Mr Lock was a longstanding member, paid tribute to him. He would do anything for anyone. Nothing ever happens round here.

Detective Chief Inspector Karen Mizzi of the Surrey and Sussex major crime team said: “Officers have been urgently making inquiries overnight to trace the suspect”.

He told the Mirror: “Findon is a small village on the outskirts of Worthing and it’s not far from London so there’s really no telling who the individuals involved were”.

“You will be truly missed by so many people”. I can’t understand how it happened. “It’s so picturesque and it’s not known for this type of crime”.

“Don was an enthusiastic member of the club and, although he no longer raced, would always support the club in his many ventures and would offer support, guidance and encouragement to all”.

Sarah Hand, a Worthing resident, said on Facebook: “There just after it had happened”.

“He wouldn’t have got out of the auto and caused any trouble at all. It’s such a quiet little village and so unusual for something like this to happen”.

Detective Superintendent Adam Hibbert said: “Mr Lock was the victim of a frenzied attack that he had no chance to defend himself against”.

A sobbing woman, believed to be Mr Lock’s wife, turned up at the scene to lay flowers, along with other distraught family members.

Anyone with information can contact Sussex Police by ringing 101 or email 101@sussex.pnn.police.uk, quoting Operation Roseberg, or call the independent charity Crimestoppers anonymously on 0800 555111.