Police have revisited a supermarket car park in Bangor, County Down, where a man was murdered.
Colin Horner, 35, was shot dead in front of his three-year-old son last Sunday afternoon.
A spokesperson said they were attempting to "jog the memories of local people".
Officers handed out leaflets asking for information about the murder and a red Ford Mondeo car which is believed to have been used by the killers.
Det Supt Kevin Geddes said: "We have received really helpful information from the public in connection with this brutal and senseless killing and I would like to thank anyone who has contacted police.
"I would ask that anyone who has captured any footage at the scene, either on devices or on dashcams, to please get in touch.
"I would also like to hear from anyone who saw the vehicle Colin Horner was driving when he left his partner's home in the Balloo Road area of Bangor around 14:00.
It was a black Nissan Pulsar car, registration XFZ 4706 and it arrived in the Sainsbury's car park around 14:30.
"I am keen to trace his movements during that half-hour period.
"Information about the movements of a red Ford Mondeo car, bearing false registration plate GKZ 7996, which was seen speeding away from the scene around 14.50 just after Mr Horner was shot, is also important to our investigation.
"It was later found burnt out at Kerrs Road, in the Six Road Ends area of Bangor, close to a local equestrian centre."