Jim Diamond

James "Jim" Diamond (28 September 1951 – 8 October 2015) was a Scottish singer-songwriter, best known for his three Top 5 hits. The first was "I Won't Let You Down" (1982), as the lead singer in the trio PhD, with Tony Hymas and Simon Phillips. His solo performance, "I Should Have Known Better", was a United Kingdom number one in 1984.
On 10 October 2015, the BBC News website announced that Diamond died in his sleep in London at the age of 64.