It is believed an Irish expatriate found dead in the sea off southeast Spain was hit by a speedboat or jet-ski.

Sean O'Siadhail, 56, who had been living south of Alicante in Spain for some time, was noticed by bathers on Saturday afternoon last.

It is thought that he had been swimming when he was hit. Reports suggest he had sustained a single deep gash on the back of his head.

A post mortem will be carried out by Spanish authorities to determine cause of death.