Police are hoping a TV appeal could help lead to a breakthrough in the case of a shopkeeper stabbed to death in his store.
Javaid Ali, 48, was attacked on June 15 in Sunshine Grocers in Green Road, Paisley, Renfrewshire.
He died in the town's Royal Alexandra hospital on June 29.
His son has already made an appeal for information about the attack and Strathclyde Police officers will appear on an episode of Crimewatch to renew efforts.
Abbas Ali, 25, one of the shopkeeper's three sons, paid tribute to his father and said his family was "absolutely devastated" in a press conference in Glasgow last week.
"He was a wonderful father, husband, son and friend," he said.
"He meant so much to us and it is heartbreaking to know we will never see or speak to him again.
"I cannot put into words the suffering this has caused our family and it will take a long time for us to come to terms with what has happened. As a father, I could not have asked for more. My dad was an exceptionally hard worker and a great provider for our family."
More than 60 officers are working on the inquiry and have visited 700 homes and taken up to 170 statements so far.
Detectives are still trying to trace a man who was seen walking from the direction of Sunshine Grocers at about 3pm on the day of the incident and a young woman carrying Aldi shopping bags. She was walking towards Green Road in the direction of the cycle track.