Walker co-wrote with Faye Resnick the #1 "New York Times" best-selling book about the O.J. Simpson murder trial, "Nicole Brown Simpson: Private Diary of a Life Interrupted" (1994) (which as of October 1995, had reportedly sold 550,000 copies). It debuted at #1 on the non-fiction side of the "Times" bestseller list on November 6, 1994.