A US visitor who died while diving in Castle Harbour on Sunday has been identified by police as Paul Latham, 55, of New Hampshire.Mr Latham, whom The Royal Gazette understands was an experienced and qualified diver, had been diving with two others when he “came into difficulty, and began a rapid ascent” at about 1.30pm, police said.He was taken to Ordnance Island, St George’s on a private dive vessel escorted by marine police, but pronounced dead at King Edward VII Memorial.Local diver Graham Maddocks of Triangle Diving, who was part of the trio, was last night receiving medical treatment as a precaution against diving complications.It’s understood the group had been observing lionfish, an invasive species known to favour depths of about 200 feet in local waters.The investigation into Mr Latham’s death is being handled by police, who have liaised with the victim’s family.