Two convicted killers have been named as suspects in the unsolved murder of a man who disappeared 24 years ago.
Kenneth Regan and William Horncy are believed to have been "directly involved" in Michael Schallamach's murder, police said.
Regan and Horncy are serving whole life terms after killing five members of the Chohan family, from Hounslow, in 2003.
Mr Schallamach, 53, from Bitterne, Southampton, went missing in April 1992.
An appeal has been made on the BBC's Crimewatch Roadshow after a letter was received by Mr Schallamach's wife, Yvonne.
Det Ch Supt Ben Snuggs said: "He was a loving family man - a father and grandfather.
"The circumstances of his going missing are really interesting - he was about to go on holiday with his wife, he took absolutely no clothing with him, has never been seen and his body has never been found."
Officers have investigated the circumstances surrounding his disappearance twice.
However, at the time he went missing police and his family were told by associates he had run away with another woman to live in Europe or Nigeria.
Mrs Schallamach received a handwritten letter sent from France from someone, allegedly called Helen, stating she and Mr Schallamach had run off together.
Police described the letter as a "smokescreen" and said information about his disappearance suggested he was murdered.
The last person to see Mr Schallamach alive, "by his own admission", was Kenneth Regan, police said.
Det Ch Supt Snuggs said officers were appealing for the public's help in trying to find the identity of the author of the letter.
"It has been 24 years since he went missing," he said, adding: "Friendships and allegiances change over the years. This may be the last opportunity to tell us what you know."
Regan and Horncy murdered Armajit Chohan, his 25-year-old wife Nancy, their two young sons - 18-month-old Devinder and two-month-old Ravinder - and Mrs Chohan's 51-year-old mother Charanjit Kaur in a bid to steal his freight business and use it as a front for importing drugs.