LOS ANGELES (Reuters) - Stevie Wonder's nephew has been arrested and charged with an extortion scheme against the singer, Los Angeles prosecutors said on Friday. Alpha Lorenzo Walker, 38, was arrested on May 2, along with another alleged conspirator, Tamara Eileen Diaz. The pair had threatened to reveal information they claimed would be embarrassing to the "Superstition" singer unless he met their demands, the Los Angeles District Attorney's office said. Celebrity website TMZ. ...