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.
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