Eye-Kyu (sometimes spelt as Eiy-Kyu) was one of the original members of D12. He is best known as being on Eminem's Infinite album, in the song "313", in which he had a lot of success. He soon disappeared after that. His last known song he appeared on was Dumpin' by Parts Unknown (Dirtty Ratt & B-Flatt) which also featured Eminem and Proof. Wikipedia
The definitive Wikipedia entry for Eye-Kyu. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Eye-Kyu