Rey Guzimano was a pianist who was once the student of Lawrence Holt, who would sexually abuse him.
History
Rey was first mentioned to Detective Jefferies by an unnamed video store owner, the video store owner says how Rey was really good at playing the piano and used him to show Detective Jefferies how Lawrence helps kids.
Rey was approached by Detective Jefferies when he was leaving a house to go somewhere. Detective Jefferies tells Rey that he owes to the community to testify against Lawrence but Rey said that he doesn't owe the community anything as he just goes there to see his mother. When Detective Jefferies tells Rey that Lawrence had gotten away with molesting children for almost twenty years Rey defends Lawrence, saying how Lawrence was the only one that believed that he could do something. Rey refuses to testify against Lawrence and leaves Detective Jefferies. (SVU: "Nocturne")