Sandra "Sandy" Lee Casey is a singer/songwriter. At one time she was married to Jeff Williams, and has sung in many of his compositions for Rooster Teeth Productions. These include "I Say Ooh", first written for the RT Short "Stand Alone", the Red vs. Blue songs "On Your Knees", "The More", "Now That We've Come So Far" and "Terrify!", and several songs on the first volume of RWBY, most notably singing joint lead on "Red Like Roses Part II" with her daughter with Jeff, Casey Lee Williams. She has also performed with Jeff at RTX 2012.
Outside of Rooster Teeth, she has played in numerous bands across America in a career that has spanned almost thirty years and numerous genres.