Kristen Vucelik was a woman who was abducted from Ohio by her father Carl, who imprisoned and sexually abused her for six years in his New York City home.
She eventually escapes, taking the identity of another missing girl, Heather Hallander, and getting the same four leaf clover tattoo as her. However, after a suicide attempt, the doctors and detectives determine that Heather's blood type didn't match the parents, leading to the discovery of Kristen's actions and the arrest of Carl. She is later returned to Ohio to live with her mother Marcie. (SVU: "Stranger")