Cleveland Police have said a " significant development" has taken place in the investigations of a suspected murder in 1992.
Steven Clark, who was 23-years-old, disappeared near his home in Marske, near Redcar, in "mysterious circumstances".
Officers have said the have identified the author of an anonymous letter sent to police in 1999, which claimed to know who was responsible for Steven’s murder. Detective Chief Inspector Shaun Page said the force had been able to speak to the author.
DCI Page also said:
DCI Page described Mr Clarke as "well-known in the local area" and that he was keen to hear from anyone who saw him on the Christmas bank holiday weekend in 1992, which was Friday, December 25 to Monday, December 28.
Two people have been arrested on suspicion of murder and have been released under investigation pending further investigation.
Anyone with information can call Cleveland Police on 101 or Crimestoppers anonymously on 0800 555 111. Information can also be given through the Cleveland Police section of Major Incident Public Portal.