John Walker was almost certainly the first black player to appear for the Imps. He made six first team appearances in 1899-1900 and also played four times for the Midland League team. He had previously played for Leith Athletic and Hearts and he cost City a £25 transfer fee. He was recognised by contemporary sources as the first black player to appear in the Scottish League. He almost certainly fell ill with TB when he was at Lincoln and died very soon after returning to Scotland. He was born in Leith and his father was probably born in Port of Spain, Trinidad. I have attached a very grainy picture of him.