Stone was the second child born to former E.A.D.A. Benjamin Stone. His older sister Pamela suffered from schizophrenia and lived in a mental ward. At a bar, Stone received a threat regarding Pamela whilst the SVU were investigating a case and was warned to drop the case. However she got kidnapped. Stone rushed to his sister to help her, but she died in his arms. This deeply traumatized him. He previously worked by his father on a serial rapist known as "Infinity" for years until it went cold.