Police hope a television show will prompt someone to "do the right thing" and give vital information to help solve a 23-year-old murder-mystery.
Tonight's Sensing Murder features the killing of Nelson man Kevin O'Loughlin who was found stabbed to death in the early hours of May, 1993, at the entrance to a city carpark.
Police hope someone watching the programme might recall information that could prove critical to the cold case.
He said finding the killer would help bring closure for Mr O'Loughlin's family.
Detective Inspector Paul Borrell said police were very hopeful that with the passing of time, someone involved or who knew those involved would feel compelled to do the right thing.
"Knowledge of a murder is a heavy weight for anyone to carry for 23 years and we are very hopeful that the publicity of this event will prompt someone to come forward with information that has not been shared with us previously."
He said police were keeping an open mind about the psychic element to the programme.
Mr Borrell said an 0800 number had been set up to receive calls and the incident would feature on the Nelson police Facebook page.
Anyone with information should call Nelson police on 0800 400 800 or Crimestoppers 0800 555 111.