A man from Wisbech who was believed to have been murdered may still be alive, according to police.
Ricardas Puisys disappeared without a trace in September 2015 and a murder investigation was launched.
But now a Facebook page has been set up using his name prompting a new police appeal.
The 35-year-old was last seen at work in Chatteris in September 2015.
Friends became concerned for his whereabouts and contacted the police who treated the investigation as a murder case.
Initially, a man was arrested as part of the murder probe but he was released without charge.
Now - four years later - police officers say the case has taken an extraordinary twist, after photographs of someone who appears to be Mr Puisys appeared on a Facebook account in his name.
Detective Chief Inspector Adam Gallop from Cambridgeshire Major Crime Unit said:
"There are a number of people that are engaging with him on that Facebook page, they're friends with him on that Facebook page and they've looked at the images he has posted and they've engaged in short messaged chats with him"
The police are appealing to anyone with information to come forward and help them close the case.