Police have seized a knife and sent it for forensic examination as they continue to question a man over the alleged road rage murder of a great-grandfather.
Donald Lock, 79, was knifed repeatedly after he got out of his car following a minor crash on the A24 at Findon, near Worthing, West Sussex.
Married for 55 years, Mr Lock, a veteran member of the Worthing Excelsior Cycling Club, died at the scene at around 8.40pm on Thursday.
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His family said he had recently been given the all-clear from cancer and was due to become a great grandfather for the sixth time.
A 34-year-old man, from Worthing, is being questioned on suspicion of murder after he was arrested by armed officers some 18 hours later.