Missing in Milwaukee: A Mother's Quest for Justice

Karren Kraemer's daughter Becky Marzo vanished from Milwaukee, Wis., more than five years ago and since then Kraemer has fought a relentless campaign against the man she suspects is responsible for her daughter's disappearance: Marzo's boyfriend Carl Rodgers. Watch the story tonight, January 7th, on a special hour of "20/20" at 9 p.m. ET "It was about letting him know that I was going to stay right there in his life. It was a mother's need to know the truth," said Kraemer. "My goal was to...Full Story