Mrs Wilson made an appeal over her husband's murder
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Police investigating the murder of the Nairn banker Alistair Wilson are following up several lines of inquiry after a BBC documentary was broadcast.
Within a few hours of Wednesday's Frontline Scotland programme being transmitted, Northern Constabulary said they had received 20 calls.
An appeal made by Mr Wilson's widow, Veronica, came almost a year after he was shot dead on his Nairn doorstep.
The programme included a recording of Mrs Wilson's 999 call.
Detective Chief Inspector Peter MacPhee said he was delighted with the response and all the calls would be followed up.
"We are acting upon all information we have received and some of that information has provided us with several lines of inquiry, which are now being followed up," he added
'Reason' sought
In the interview, Mrs Wilson said she needed to have a "reason" for the shooting so she could explain it to her young sons.
The programme also included footage of one of the couple's sons being told about his father's death.
Mr Wilson, a 30-year-old business banking manager with the Bank of Scotland, was shot by a mystery caller as he was preparing his sons for bed on 28 November 2004.