It just doesn't fit. Why would Melissa Huckaby, a 28-year-old Sunday school teacher with no history of violence, molest and murder little Sandra Cantu? Women just don't commit this type of crime, unless they've teamed up with a violent man. So did Huckaby act alone, or is she protecting someone. That's just one of the provocative questions raised in an interesting piece worth reading in yesterday's San Francisco Chronicle.