Neil Charles, 47, was stabbed in the chest in June 2021 in Bury St Edmunds, Suffolk. He had been seen earlier that evening attempting to open car doors.
Both David King, 55, and Edward King, 19, of Radnor Close, denied murder, with the father claiming that Mr Charles had run on to the knife.
They will be sentenced at a later date.
Ipswich Crown Court heard during the trial that David King was shown CCTV footage of Mr Charles on his driveway by his son and wanted to “stop and detain him.
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Suffolk Police said they received a 999 call from David King around 3.55 a.m. on June 20th, stating that a man was attempting to steal from his car on the Moreton Hall estate.
King informed the call centre that he had attempted to apprehend the man who had fled.
He was unsure whether Mr Charles was injured or “acting,” but he may have been hurt when he ran at the knife he was holding.
Prosecutor Christopher Paxton QC stated during the trial that the two defendants were armed with a sword and dagger and desired “rough justice.”
Mr Charles was found seriously injured in Winsford Road by police, and he died two days later.
