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.
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