Ricky is a drug addict who was molested by his piano teacher Lawrence Holt when he was young.
History[]
When Evan was given pictures of the boys Lawrence took inappropriate pictures of, he identified one of of the boys and he also pointed out that Ricky was a drug dealer.
After Evan refused to testify, Detectives Stabler and Benson had to choose between Ricky or another kid named Cesar to testify against Lawrence, and the detectives chose Ricky. Ricky was tracked down and the detectives asked questions about Lawrence to Ricky. Ricky denied that Lawrence had sexually touched him in any way and even said how warm Lawrence's room was while he was outside in the cold now.
Later, the detectives get Evan's testimony and they are able to put Lawrence in jail for 115 years maximum. (SVU: "Nocturne")