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3 February 2011, 14:19 | Updated: 10 February 2011, 16:45
Detectives have traced a couple documented as witnesses to serial killer and rapist Peter Tobin's wedding following a television appeal.
In the BBC Crimewatch programme, police said they were looking for a Mr and Mrs Hardy who acted as witnesses to Tobin's first marriage in Brighton in 1969 to Margaret Robertson, who was 18 at the time.
Police are investigating the past of Tobin, who is serving three life sentences for the murders of schoolgirl Vicky Hamilton, 15, Dinah McNicol, 18, and 23-year-old Angelika Kluk.
It is feared the 64-year-old may have committed many other violent offences.
Seven rape victims were identified following a previous appeal in July.
Police said the Crimewatch appeal, broadcast last week, was very successful.
Detective Superintendent David Swindle, of Strathclyde Police, said: ``The response from the public has again been extremely positive and, through Crimewatch and subsequent media appeals, we received a large number of calls from people determined to help us piece together the missing gaps in Peter Tobin's life.
``We are delighted to have traced the couple named on Tobin's marriage certificate, and they will now form part of our inquiry.
``At this stage it is too early to say if they hold any information that could be of assistance, but time will tell.''
Police set up Operation Anagram after the rape and murder of Polish student Ms Kluk at a Glasgow church in 2006.
They followed a trail to the garden of Tobin's former home in Margate, Kent, where they unearthed the bodies of Ms McNicol and Vicky two years later.
By piecing together information on his whereabouts over the years, police hope to establish whether he can be linked to, or ruled out of, other crimes.