Mr Porter said he had been touched by messages of support
A Nottinghamshire man is raising money for a private detective to investigate his mother's death in Crete.
Jean Hanlon, 53, originally from Dumfries, moved to the island in 2005 but her body was found in the water at the port of Heraklion five months ago.
Michael Porter, 25, who is studying in Mansfield, said he was frustrated at the lack of news from the inquiry.
He is organising a concert at the town's Palace Theatre with funds going towards hiring the detective.
Mrs Hanlon was last been seen at a Cafe in Heraklion on 9 March. Her body was pulled from the water four days later and police are treating her death as suspicious.
A Facebook page has been set up to gather support and information.
Mr Porter said the move did not mean he had lost faith in the local police.
"It is not an accusation that they have not done anything, it is simply the frustration of: 'We don't know'.
"Therefore we would like to help and assist them in finding out exactly what is going on."
He added: "She had built up a close knit group of friends on the island and I have been touched by the support they have offered, as well as the support here in Mansfield."
The concert will feature a variety of musical acts, including West End singers.