- 18 updates
The suspect in the road rage murder of pensioner Don Lock has been named as Matthew Daley, 34.
Daley was arrested 18 hours after Mr Lock was stabbed to death an alleged road rage incident in West Sussex.
Police have been granted further time to question the man, from Worthing in Sussex, and have until midnight tonight to complete their enquiries.
Police have been granted further time to question a 34-year-old man on suspicion of murdering great-granddad Don Lock.
The suspect was arrested 18 hours after Mr Lock was stabbed to death in an alleged road rage incident in West Sussex.
Sussex Police told a press conference they had until midnight on Sunday to question him further.
The son of murdered cyclist Don Lock has paid tribute to his "dearest dad" saying: "Now you are flying high with the seagulls".
In a handwritten note, Andrew Lock said his 79-year-old father would be "forever in our hearts". "We will always look up to you. Miss you big time", he added.
A 34-year-old man has been arrested on suspicion of murder after Mr Lock was stabbed to death in an alleged road rage attack. He remains in police custody.
A knife has been found by detectives investigating the murder of Donald Lock - the 79-year-old man killed in a suspected road rage attack.
Sussex Police said the knife had been sent for forensic tests.
A post-mortem confirmed that the great-grandfather - who had recently been given the all-clear from cancer - died from stab wounds.
Detectives are continuing to question a 34-year-old man on suspicion of murder.
Tributes have been left to keen cyclist Don Lock, who was killed after a traffic dispute on the A24 last night.
Amid floral tributes left at the scene of the murder in Findon, West Sussex were a cycling helmet and a bunch of flowers reading: "Ride safe up there Don!"
The widow of 79-year-old Don Lock has paid tribute to her "wonderful husband" as she laid flowers at the spot where he died.
A tearful Maureen Lock told waiting reporters: "We were married for 55 years and it ends like this" as she was comforted by family members.
Police have arrested a 34-year-old man on suspicion of Mr Lock's murder following a manhunt.
ITV News cameras captured the scene of a man's arrest over a suspected road-rage murder on the A24.
The 34-year-old man was taking into custody by armed police around two miles from the "frenzied" knife attack which killed 79-year-old Donald Lock last night.
The family of Don Lock has issued the following tribute:
"Don has been a keen cyclist since the age of 12 and had been an active member of the Worthing Excelsior Cycling Club since 1960.
"He was not your typical great grandfather and was still cycling up to 150 miles per week.
"He still holds the club record for the 24-hour time trial having remained unbeaten for 44 years.
"He was full of energy having recently been given the all clear from cancer. Not only was he passionate about cycling but he had also been supporting Brighton and Hove Albion since the 1940s and was a season ticket holder.
"He loved travelling the world with his wife Maureen and he adored his family. He and Maureen had just celebrated their 55th wedding anniversary.
"Don leaves son Andy, daughter Sandra, four grandchildren, and five great grandchildren with the sixth great grandchild due later this year.
"Don had lived in Worthing for 55 years and was a popular member of the community.
"He was hugely loved by his family and friends and could often be called upon for his cycling or travel advice. Words cannot describe how much he will be missed."
No other suspects are being sought at present over the murder of a 79-year-old man in an apparent road rage incident, Sussex Police say.
A 34-year-old man was earlier take into custody on suspicion of the murder of Don Lock, 79, on the A24 in Findon.
Latest ITV News reports
Mr Lock's son Andrew said his 79-year-old "cycling mad" dad was the "perfect role model".
Sussex Police are hunting a man suspected of killing another after their cars collided