Detectives hope that this fresh appeal will help them trace whoever is responsible for the 1996 murder of Caroline Glachan in West Dunbartonshire.
Police Scotland appeal for any information that could help trace the whereabouts of Arbroath man Ian Mowatt.
Anyone with any information in connection with the murder of 30-year-old banker Alistair Wilson should contact Police Scotland.
Police are appealing to anyone who has any information that can assist in locating her remains.
Mr Sibbald was last seen leaving his home address within Portobello on Tuesday 8th October 2002. There were no sightings of Mr Sibbald after that time.
John Coleman was last seen at the Access Point in Leith Street on Friday 1st May 2009.
Matthew was last seen at 5pm on Tuesday 17th February 2009 on the High Street in Eyemouth.