Detectives investigating the murder of bank executive Alistair Wilson said they have had a good response to their request for DNA samples.
Police probing Alistair Wilson's murder carried out DNA tests
Northern Constabulary officers have been seeking DNA from people who were in the area of the Nairn man's home on the night that he was shot dead.
They said that about 150 people were invited to give samples in tests carried out on Friday and Saturday.
The results will be compared with DNA samples found in the area.
Mr Wilson, 30, who was married with two children, was gunned down by a lone killer on the doorstep of his home on Crescent Road.
About 40 officers have been involved in the murder inquiry and have been trying to establish a motive for the killing on 28 November last year.
Detective Chief Inspector Peter MacPhee, who has been in charge of the manhunt, said the tests were being carried out in order to eliminate people from the investigation.
He promised the samples will be destroyed once the murder has been solved.
In December, officers announced that a handgun which was found in a drain near the scene was the murder weapon.
The suspect they have been looking for was described as being aged 35 to 40 and was wearing a baseball cap and a dark blouson jacket.
Crimestoppers and a national newspaper have each offered £10,000 to anyone with information leading to the capture of the killer.